UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Users Uploading Avatars - Directory Issue

If the forum itself is working just peek at your paths for the forum.
Control Panel » DB, Paths & URLs
Absolute PATH to Main Directory:
That should give you a clue for the proper path.

I can't seem to remember now but I think the paths still should be a forward slash with a windows box.