I've deleted just about all the files of World of Warcraft because the program and patch is about 5GB and my computer doesn't have too much mem. space.

I got to deleting the patch though and I can't...

I get an error message saying...

"Cannot Delete Patch. MPQ: File or source may be in use"

Can anyone help????

Have you tried to reboot your computer then delete the patch as it still could be running as a process in the background of the computer.