Note that AdAware and SpyBot S & D will each catch some things the other
won't. Also, each need to be updated before every use, even when just
downloaded. There's also a lot more to do than just those two programs.
If trying everything at that site does not fix the problem please post back
in the same thread.
If the computer reboots then it may be hardware problem.
The cause could be heat in the computer box.
Clean the fan in the back of your computer box and make sure that the small
fan on the motherboard for the CPU is running ok.