Well, Windows XP doesn't have "Scandisk" like in earlier versions of Windows, but it does have "Error Checking/Chkdsk" which is a disk checking program similar to Scandisk. It still has "Disk Defragmenter". It also has "Safe Mode" but it's NOT necessary to run "Error Checking" or "Defrag" in "Safe Mode". Check the links below for information about those items. (They come for the "Tips for Computer Newbies" in this forum.)

Both "Error Checking" and "Disk Defragmenter" can be found in the same location using the info below. I normally run "Error Checking" every 2 months or so, while I run "Disk Defragmenter" more frequently depending on the amount of work I'm performing on the machine.
How To Run 'Error Checking/Chkdsk' On Win2000/XP

How To Start In 'Safe Mode'

And just to keep you safe, here's some good reading also:

BEFORE Internet: Windows 2000 & XP Need Protection

Hope this helps.