Windows XP Home Font problem

Well......... my parents computer went tweaky. I uninstalled a game I had on there (Star Wars: Empire At War to be precise) and afterwords I rebooted, and the computer went tweaky. Well... the fonts went tweaky. Completely tweaky. I tried to fix them, and well... now I've got this:



So, my question... How do I return this to the Windows XP Home default? They just want a return to the basic normal windows text. This has even moved over to all the programs I've got, including Firefox, IE, Explorer, etc. Help?

edit: I got this right after when I was messing with the themes trying something there. All I did was try to revert from Windows XP Theme to Windows Classic.



there was another error, but the screenshot didn't turn out.

edit2: The extent of the damage/problem





With steam, we have missing text. If you use steam you know what is missing. If not, most of the blank areas shouldn't be.