ERROR - Unable to find the AVP2.rez file Fix

Seeing as you've tried uninstalling, SOMETHING's gonna be out of place even if not all of it. Finishing the job and reinstallin' sounds like the way to go. First, go into your Program Files folder, find the AvP2 folder, and delete it. Then you'll have to clean the registry to remove all trace of the game from the comp's memory. Be very careful doing this; erasing the wrong folder can result in Very Bad Things...

Cleaning Registry Entries:

1. Make sure you're on your desktop with all windows closed (print this post out if need be)
2. Left-Click on "Start" in the lower left
3. Left-Click on "Run"
4. Type in "regedit"
5. Left-Click on "OK"
6. Left-Click on the + by "HKEY_LOCAL_MACHINE"
7. Left-Click on the + by "SOFTWARE"
8. Left-Click on the + by "Microsoft"
9. Left-Click on the + by "Windows"
10. Left-Click on the + by "CurrentVersion"
11. Left-Click on the + by "Uninstall"
12. Left-Click on "{3EF79591-BF16-4CF8-8FF0-D8AD968228B1}"
13. Press the "Delete" key on your keyboard
14. Left-Click on "YES"
15. Retrace your steps until you reach "Microsoft"
16. Left-Click on the - by "Microsoft"
17. Left-Click on the + by "Monolith Productions"
18. Verify that you only have AVP2 in there(and not NOLF or any other Monolith game) If you don't have any other monolith games:
A. Left-Click on "Monolith Productions"
B. Press the "Delete" key on your keyboard
C. Left-Click on "Yes"
19. If you have other Monolith games in there:
A. Left-Click "Aliens vs. Predator 2"
B. Press the "Delete" key on your keyboard
C. Left-Click on "Yes"
20. Close the registry editor
21. Attempt to install AVP2