Have you ever had software that shows up in Add/Remove Programs, but doesn't have the Remove/Uninstall button?
I recently had a program (a custom repack of WinZip) that only had the Repair option. Well, I use WinRAR exclusively, so I wanted to remove it.
To fix this open Regedit (Start, run Regedit), and navigate to HKLM\Software\Microsoft\CurrentVersion\Uninstall\
From here, you can either go through each sub-folder, looking for the software in question, or highlight Uninstall, go to Edit, Find and type the name of software you are looking for.
Once you find it, look for two keys: NoModify & NoRemove - they are pretty self explanatory as to what each key does. Change the key value from a 1 to a 0 (zero) to deactivate the key.
Next, open Add/Remove Programs again, and you will see the Uninstall button now!