Oh boy, I walked someone through a restore of icons after stardock messed up his system in another forum a while back. He was successful after a few steps. Here's what I started with for him:
First off, make a system restore point.
Now, look for imageres.dll.mui in System32 folder. Rename it back to imageres.dll. You might have to take ownership and/or turn off UAC while you are doing this. This in itself may restore your original icons.
If not I found this: http://forums.stardock.com/370831
And this: Restoring the original Windows icons
See if this doesn't work for you, then report back. If need more detailed instructions, post back and I, or someone, will walk you through taking ownership, turning off UAC, etc.