You won't be able to run system restore by clicking the icon, because the run path has been cahnged and therefore the system doesn't know where to find it .. Look in the
C:\WINDOWS\system32\Restore
folder and run the rstrui application. If this works, repeat the process above for appending the run path, but make sure that you cursor to the end of the path that is already there, then put in a semi-colon followed by the path to your csc compiler, as before.
Hope all goes well.
duncan