Question : Problem: Sound Distorted & Computer Slow

When I open programs and even when I start Windows it seems to be very slow, lagging. Sounds are distorted as well. For example if I am starting up Windows the start up sound like skips.
If I have itunes playing and try to open any program it will lag until the program finishes opening.
The problem occurs with all programs, even the OS. I am running WinXP with all the updates, I am virus free and I have used Spybot S&D as well as Hijackthis and Windows Defender to make sure I had no spyware/adware. I ran Dell Diagnostic to see if it was a hardware problem and all tests passed.

Any help? PLEASE?!

Answer : Problem: Sound Distorted & Computer Slow

"You may experience performance issues after you install the 811493 (MS03-013) security update"
http://www.networkworld.com/news/2003/0422lateswindo.html
http://support.microsoft.com/kb/819634
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