You might have delete somefiles by mistake and now it's missing the file it needs to uninstall it. Try downloading the Same program in hopes that it will put the missing installer file it needs and then try to uninstall it again.

Maybe it's a windows problem and you just need to update your windows, you can also try this www.windowsupdate.com and update your system which alot of people don't realize must be done with new programs coming out putting a demand on the system anymore.

If not, what I would do is manally delete everything on the computer and even in the Registory.

I hope this helps you.
J