check for burr or wear on the throttle shaft or end of govenor rod that mounts into shaft. Also lever pressing on govenor rod under the flyweel may be inproperly set. if the lever is set too high the throttle plate will open too far and bind up when the engine is started. move the govoner linkage down when you first start the engine to see if it binds somehow.

Any chance that you are using old fuel? Our local stihl guy says max 8 week old fuel. If in doubt, I'd put in a new spark plug (just clean the one you've got if it's not old, and make sure you didn't drop it and screw up the gap) and at least clean the air filter. Empty the fuel that is in it and put in fresh (you don't have a primer bubble?). Try setting it on the floor and put your foot in the handle and hold the loop handle with one hand while starting it with the other. Full choke and full quick pull. As soon as it even hints at a spark (usually by the second pull) go to half choke and it should start right up. You shouldn't touch the gas trigger until it is started. Otherwise, you'll flood it and wear yourself and three of your buddies out trying to start it. Sounds like that may be part of your problem because, by the time you took it to someone else, it started right up. If that doesn't help and you have a stihl dealer handy (or any good service shop)they'll take care of you. There's no shame in starting a saw on the ground. Good Luck

Here's my hijackthis file Logfile of Trend Micro HijackThis v2.0.2 Scan saved at 1:22:25 PM, on 2/23/2010 Platform: Unknown Windows (WinNT 6.01.3504) MSIE: Internet Explorer v8.00 (8.00.7600.16385) Boot mode: Normal Running processes: C:\Program Files\Alwil Software\Avast5\AvastUI.exe C:\Program Files (x86)\Internet Explorer\iexplore.exe C:\Program Files (x86)\Internet Explorer\iexplore.exe C:\Program Files (x86)\Trend Micro\HijackThis\HijackThis.exe R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896 R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157 R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157 R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896 R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896 R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157 R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = F2 - REG:system.ini: UserInit=userinit.exe O4 - HKLM\..\Run: [avast5] "C:\Program Files\Alwil Software\Avast5\avastUI.exe" /nogui O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'LOCAL SERVICE') O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'LOCAL SERVICE') O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'NETWORK SERVICE') O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'NETWORK SERVICE') O13 - Gopher Prefix: O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing) O23 - Service: avast! Antivirus - ALWIL Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe O23 - Service: avast! Web Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing) O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing) O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing) O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing) O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing) O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing) O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing) O23 - Service: Remote Procedure Call (RPC) Net (rpcnet) - Absolute Software Corp. - C:\Windows\SysWOW64\rpcnet.exe O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing) O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing) O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing) O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing) O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing) O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing) O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing) O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing) O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing) O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing) O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing) -- End of file - 4949 bytes Nancy

I'm going to try Bugspop1's suggestions. I have Xfinity1 and ATT routers, so it may be perilous and require calling them again for help. Also both routers have been replaced in the past 2 weeks because of other problems: The ATT router suddenly and mysteriously stopped allowing any telephone caller ID and calling features...the technician who replaced the router said he didn't know why this happened or what caused it. ATT provides 3 mbps speed, which is (from my experience) not fast enough for Amazon video, so we use ATT mainly when Xfinity isn't working. We have just one phone connected to ATT. The Xfinity/Comcast router was replaced last week because of tv issues. I got fed up with the poor service on the last cable boxes. All channels not HD were stretched to fit the format of our HD tvs. So all the people on tv look like they weigh 500 lbs. Comcast refused for months to provide info to change this in the setup menu of the cable box. So after hours on the phone to them and several trips to their store, we now have tv that shows HD and SD in the proper formats. I also had to accept yet another phone line from Comcast, their bundle, to save money. Their internet/tv bill was $270. The new bill including phone is now supposed to be $190. The stupid downside to this is the Comcast rep said I have to call Comcast on the phone number they provide, otherwise they won't provide any support. I already have 4 phone numbers so this is very annoying to me. After the cable boxes were replaced the internet router was reset by Comcast when they set up the cable boxes. That evening I logged in to the xfinity web site and saw that some videos would play and others wouldn't. CNN wouldn't play anything at all (though accessing the site outside of the xfinity portal allows some videos to play). So I called up Xfinity support who weren't helpful at all. They actually said they don't support video playback help issues on their own site! So their support is less than adequate imho. I tried the suggestions about changing video quality...Amazon works ok in SD. In HD videos start off in very poor quality and gradually get better. I don't use amazon streaming when I'm out of town because the site only streams in HD and would quickly use up my data allowance. Windows Defender is up to date. Nvidia has automatically updated it's drivers several times since I got the MSI laptop. The MSI also did the update where it installed a new version of Win10 (It took about 17 hours). There isn't any software in common on the two laptops. I tried a system restore on the MSI. It didn't help, but it didn't hurt. I uninstalled and reinstalled Adobe flash several times. If I can get inside the router setup menus is it easy to figure out if the routers are allowing adobe flash video? I'll keep working on this....