No offense taken. I never recommend realtime applications other than a single AV. Without this limitation a user could inundate there system with applications running in the background which would demand resources and possibly conflict with one another. For all the postive service they could provide the potential negativity is there too. A user has to accept some responsibility for awareness, and protection such as frequent scheduled scans. Just two schools of thought. DA

Can you locate this file in Windows Explorer? "C:\Program Files\Malwarebytes' Anti-Malware\mbam.exe" If yes, then it is installed you should be able to run it. If you don't, then either it isn't installed properly or perhaps you got a rogue program if you downloaded it from somewhere other than the Malwarebytes web site. Here is a link that might be useful: Malwarebytes Download

Jane you cannot copy an installed prgram to another computer. However if you go Here and download the free program then go here to get the latest definitions. Copy these to a thumb drive or external drive. Install the program then double click on the latest definitions (your second download) and it will update Malwarebytes for you and you are good to go.

Thanks for the advice, and I am heading over to the link now. I have Home XP, 2004 HP pavilion a410e, and as my PC was working fine after installing the power supply, but started slowing down a day or day and half later believe that is when I got infected. I have used Norton for 6? years without trouble and is on auto update. However, it is possible that the trojan/virus did something there. I tried to contact Norton and was very distressed to find that it was difficult to reach them through site or email. It took several tries for me to even find the contact site, or the discussion forum; but then couldn't register or use chat to speak with a tech. That was probably on my end and I needed to adjust some setting = but it sure didn't set well with me. thanks again, heading to link!