I was gonna say 'do a system restore' but I see you use win 98
Of course you can do it manually for all the file extensions Paintshop fucked up....
* user13774 is googling 
I found something that might work but the program was only for xp...
* user13774 is still googling
Found this program which you can use for easy changing your file type icons.. donno if you can also do something as reset to system default icons or something.. you should try it out
!
http://www.virtualplastic.net/scrow/iphile/iphile.zip !
homepage of iphile
Edit:
Sorry NoName.. missed ur post... but here's a link sean
