I'm running Win XP, and I was downloading some software over the last few days for popup blockers, and I downloaded Yahoo Blocker, Google Blocker, and then ran AdAware 6 [which I've since removed to get Ad Aware SE]. Anyway, I'm having very high CPU usage, and High Memory Usage in the Windows Task Manager. I keep closing dostask.exe because it keeps using nearly 90-100% of the CPU, and it keeps maxing out my memory which is 1/2 Gig. When I start the machine, the system runs fine, but then it begins to climb. I close it, and it climbs again, and then repeat. I also did a search for dostask.exe and found this file: DOSTASK.EXE-25D34F68.pf located in the F:\Windows\Prefetch folder. Any help is appreciated. Important Note: F:\ is my main drive. Can anyone tell me what I should do?