Can't remove AC 9 or 10?

[Anonymous]

Running AC 11 for about a year on XP platform; works well. Recently lost our AC10 library which caused some problems opening circa 10 files. Reloaded 10 and now all of our files open with 10 by default. Want to remove 9 and 10 but keep libraries- Uninstaller comes up with a blank screen and then freezes on both 9 and 10? Tried windows removal and it defaults to Archicad uninstaller.
Help would be nice.
AJ

[Thomas Holm]

I guess simplest way to fix this is to let AC9 and 10 be and re-install 11. Then XP should open your files in AC11 by default. The better way is to create desktop shortcuts for all programs, and always open the program by double-clicking those. Then you have full control.

[Anonymous]

Good advice. It worked. Instead of a full re-install, I just ran the repair and it now defaults to 11. Found a note about the uninstallers that if v. 1.4.something of Java env. is no longer on computer the uninstaller won't work.
Thanks-AJ