recently reinstalled windows XP on my Dell Inspiron 5150. The system is as follows:

Windows XP Home
2.66 gHz Pentium 4
1.00 gb RAM
Nvidia GeForce go 5200 64mb

After reinstalling windows according to the instruction on dell.com, I have been having a problem in which every time I attempt to play Warcraft III or watch any kind of video online my computer usage goes to 100% and sometimes the computer locks up, other times it just crawls to the point that mouse movement is choppy. When I open the task manager to see what processes are taking up the 100%, it is always five or six different processes at anywhere from 15-30% each. It is never the same processes. Dell phone support told me that it was a software problem, but this cannot be the case because I have the exact same software on my laptop now as I did before reinstalling windows. I was thinking it could be a driver conflict or something. If anyone has had the same problem and resovled it or if anyone has any knowledge help is appreciated. Thanks!