If I might interject...
Picolo, I know that PC Health
is related to Windows Help and Support Center, but I had never heard of it collecting data and running at 10 minute intervals. However, with a little research I found that Windows ME
has a PC Health Client Scheduling Application
that does that. But according to my research this only exists in ME, not XP. So PC Health should not have any relationship to your problem. Scroll down some to the relevant section here:http://www.answersthatwork.com/Tasklist_pages/tasklist_p.htm
The following link gives some more info on it:http://www.tomshardware.com/forum/166573-48-health-scheduler
So please don't try to delete any PC Health folder--besides being "in use" Windows File Protection probably wouldn't let you anyway. Even if you could it would more likely cause problems and won't help resolve your issue.
This sounds to me more like a hardware problem, but it could be just about anything. Are your video card drivers up to date? We will need more information from you to be able to troubleshoot the issue. Give us some more specs on your computer. Is your video card onboard and if not, what kind is it? How many Watts is your power supply? Did you buy your PC from a store with Windows pre-installed and if so what make and model is it and how old?
Also, as joseibarra
has alluded to, are you sure it is every ten minutes exactly? I.E., are you timing it or is that your estimate? Are you using the computer when the screen goes blank or has it been idle? You mention that the screen comes back if you hit the space bar--is it just the space bar or will other keys or the mouse click also do the job?