I don't think that your files will really be deleted, it's probably just that your system has set up a new set of default things to display to you in place of the settings that you're used to seeing (if that makes sense).
If you look in the
C:\Documents and Settings
folder then it'll list various users. One might be the new you, another the old. The "missing" files may be in there.
Is it just your settings that have gone wonky? It's not that programs are no longer installed?
Oh, finally - you've triggered one of my pet hates...
"it must of froze..."
Please, in future, say and type "it must have" or I'll go even more round the bend. Thank you :-)