Reset your user preferences to the default values by using Firefox Safe Mode. This will rebuild the prefs.js file from program defaults, the same as if you manually deleted the file. It will not reset any preferences stored in the user.js file, if one exists. Exit Firefox completely Start Firefox in Safe Mode. The "Firefox Safe Mode" window will appear with some troubleshooting options, Select the option, Reset all user preferences to Firefox defaults. Click the button, Make Changes and Restart. FF - prefs.js: browser.startup.homepage - hxxp://z1.invisionfree.com/IBBS_ComputerHelp/index.php? Not what that is above! Are you. FF - prefs.js: keyword.URL - hxxp://yandex.ru/yandsearch?stype=first&clid=1855511&text= Start firefox in safe mode ---->http://support.mozilla.org/en-US/kb/Safe%20Mode

Owbist, I have run Ccleaner several times to clean up all leftover install files and registry fixes but the problem still occurs. I can't find any episode in the event viewer that refers to PowerPoint. I think it is really a buggy problem that Microsoft doesn't even have a fix for. I searched at Microsoft for a fix but never found one. I can work around it by transferring all the PowerPoint files I have onto a thumb drive and then move them to my desktop that is running Windows 7. The problem is only on the laptop which I am currently using. I will be taking my laptop with me when I leave to go to Norfolk tomorrow. I am spending Christmas with my youngest son and his family. I fly out in the morning.

Thanks so much for the help. I'm a real dummy at this. judys ont, when I went there, it was all grayed out and I couldn't do anything. That led me to believe I was missing something some place. I, then, kept experimenting and finally found the problem. I had neglected to go to " slide transitions" and do the settings there. Everything is fine now and I'm so pleased. Thanks to for your offer ,jodi. I really appreciate it. Maybe next time, I will remember, or maybe I should pactice more - or probably both. ivamae

1. Try importing the slides from the PPTX file rather than actually opening it. Click "Insert," then "Slides From Files." Browse to and select your file, then click "Insert All." This might extract the slides from the corrupted file and place them in a fresh file, though the formatting may be lost. Checking the "Keep source formatting" box might help. 2. Try opening the presentation in Word. Open Word and click "Open" in the "File" menu. Use the "Files of type" drop-down menu to select "Recover Text From Any File," then try to open your corrupted PowerPoint file. Again, most of your formatting will probably be lost, but your data will be there. 3. Check for a TMP file. These are temporary copies of recently accessed files. There may or may not be a temporary copy of the file you want, but it's worth a shot. Right-click the "Start" button, then click "Search," and run a search for "*.TMP." The search will return many files, most of them probably with incomprehensible names. Click the "Date Modified" button to sort them according to the last time they were edited and find a file that was created around the time you lost the PowerPoint file. Try to open this in PowerPoint. 4. Try opening the file in a different application that supports the PPTX format. The most prominent of these is the Impress program in the OpenOffice suite, a free, open-source alternative to Microsoft Office. 5. Otherwise you may apply http://www.pptx.openfiletool.com/ PPTX Open File Tool