What else is it telling you with the error? Usually it's something like:
Primary Disk 0 not found
Press F1 to continue, or F2 to enter setup.
This is just an example. But usually when F1 to continue comes up, there's an error that precedes the message.
Since having my computer repaired every time I turn it on a message comes up that tells me to press F1 to continue. It then boots up to my desktop. How can I correct this problem. I run XP.