This Dell forum is a little slow. Try the Cnet Computer Help forum.
You can be sure many will ask what's in task manager at high percentages and about your malware protection.
Bob
Hi
I'm using windows 7 for the last 5 months without any trouble. But recently I'm facing a problem frequently, when I start the pc the cpu usage is almost 100 percent. Whenever I do any task the cpu usage is constantly 100 percent and the pc acts very slowly. Please advise me.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic