I'm running XP Pro on a Dell Latitude D610 laptop. Occasionally some (but not all) programs plus Windows Explorer will lock up. I can switch between the programs that still function using alt+tab, but the task bar does not work and the task manager will not open. Occasionally I will get HDD errors as well, though that may or may not be related. In general the computer is running extremely slowly and I cannot seem to figure out what the issue is. Any assistance would be appreciated! Also, these lockups last for 5-15 minutes and then resolve themselves for no apparent reason. The HDD light is not showing activity during this time.