Microsoft released update Q811493 on April 16, 2003. I installed it on my XP Home Edition and my computer immediately slowed down. Timeouts of 30-90 seconds started appearing during normal operations such as starting some applications and selecting File > Open. Other users have reported similar slow down.

I removed Q811493 (via Add/Remove Programs > "Windows XP Hotfix (SP2) Q811493") and my XP has returned to its normal speed.

Yours truly,
Cusimano.Com Corporation
per: David Cusimano