The usual questions LafKat

You know the routine:
What platform?
What hardware configuration? (HD's, RAM, Processor) What opperating system?
Have you installed any new programs in the last week?
What programs are running in the background? (See Nick above) Power off - Power on - does the problem continue?
Scan/Defrag repeat above

If it still continues and you had an ounce of understanding - you could go to "high jack this" - but you don't - so you could use "Go To My PC" and let a techno-nerd look it over....(from anywhere in the world) an old friend....someone you trust....like me.

Are you trying a new Vista system...they take awhile (12 months) to get "dialed in."

MANY "security" programs will read the line-code-NAME of a definition within another "security" program as if the NAME ID was the actual problem.

My guess - you opened too many windows with limited RAM and you froze.

Sincerely,
Gargoyle