I have seen there is so much useful information here, so I decided to ask for your help. I've had problems with trojans lately, I saw there are some programs to run before posting, but I have another problem to solve first (because my pc can't run all these programs).
Sometimes when I run a program, the CPU usage goes up to 100%, the fan starts buzzing more and more and the computer shuts down. It happens when I run AdAware, Ewido, and even Disk CleanUp, or when my daughter starts to play a game. If I want to run AVG, I have to pause the scanning many times and leave the computer cool down.
Sometimes when I run a program which takes up a lot of memory, I shut down many other programs, but the CPU still goes up and the fan buzzes more and more.
I think (but I'm not sure) it all started when the new DSL connection was installed (it should be wireless, but the wi-fi connection doesn't work). The DSL provider doesn't have many specialists, so they use electricians who took a short course on computers. Three people worked on installing the connection, on two different days, right now I'm happy it can connect to the Internet (even without the wi-fi, though).
I have a Packard Bell laptop, Windows XP, Intel CPU 2,66 GHz, 1.60 GHz, 480 MB of RAM, about 25% free space on the hard disk.
Thank you very much