A scratch install can be easy or disastrous. If you use the original restoral CDs it's pretty easy, just follow the prompts. If you use a scratch (full format and reinstall from a stand alone XP CD) it can be not so easy leaning toward failure. Reasons:
Restoral CDs contain all the drivers for the PC. Sound, modems, graphics, etc.
Full format contains none of these and you will have to find all the drivers. Without them your sound and video will not work.
Either method will destroy everything on the PC including favorites/bookmarks, emails, messages, accounts, pictures, music, documents, etc. on and on.
Again, if it aint' broke. . .
Is it safe, or practical to reinstall windows? I had to help my sister do hers the other day, and it's running much better. It was really messed up! I got to thinking,maybe I would do mine so it would be like new. It's about 14 mos old and I'm not having a problem or anything, but I'm bad about installing and uninstalling stuff. I just figured it would clean up the hard drive just like new. I don't really know why I'm so antsy to do this. I would like some advice as to wether I should go for it, or leave well enough alone??....Maggie