Windows 7: Theme problems

I'll try to give an accurate description of what happened. So I got a new 3rd party theme that I wanted to install, but I didn't know how, so I went and googled it. So, I did what the website told me, but I think I did something wrong, because now when I try to reverse it, It doesn't work. What I did, was I switched out the 'Shell' folder in .../Windows/Resources/Themes/Aero with the one in my 3rd party theme's folder. Now when I try to change it back, any windows program that I open (Like If I open Start>Computer, or Documents, or anything like that) What it gives me, is just an open window. It gives me a window, but it's completely blank. I can't do anyting, once I open it, I can't close it, I can't minimize it. It just freezes, and it looks like its loading, or something, but it doesn't respond. Each time I open one, I have to CTRL>ALT>DEL and manually shut it down through task manager. I need help on this.
Thanks ahead of time.

P.S. What I need help with, is I want to put everything back to normal. Thanks.

hello
do you have restore point?? do the restore since before the problems.

Okay, yeah thanks, it worked. Thanks again.

what third party theme was it , you may want to check out this thread HERE for safer themeing,just ask if you need any advice

you're welcome.glad hear it solved.

It was Mac OS X iLimited. I got it from deviantART.

make sure you download from the trusted web.