My Computer can't run .exe Files.

Hello,
I'm having a Horrible Time here. My brother was running some kind of patch to a game called "Company Of Heroes" to my computer when it crashed and shut itself down.

He won't tell me the exact details other than it was something that already worked on his computer, but when I turned my computer on, I realised that my computer suddenly 15-20 Daemon Tools 'Mounting Image' Signs. A closer look at my laptop revealed that several of my Icons have been replaced by Daemon Tools files. After clearing the 15 Mounting Image windows that stayed on 5 seconds approx, it was quickly obvious that my computer could not run any .exe files at all, which effectively disabled my anti-virus systems as I just realised that the 15-20 Windows earlier was my opening processes attempting to run. As such, I am unable to scan for viruses. I tried several actions, like restoring my system, which could not work since it was a .exe, attempting to use Run to run the .exe, and uninstalling Daemon Tools. (Which the uninstaller was .exe and wouldn't run.)

So now whenever an attempt at running an .exe is done, a Mounting Image window would pop into my face. This includes Task Manager and RegEdit. The only programs that can work are Windows Explorer and Opera. (Due to some weird way Windows Vista handles Default Browsers, I can only run it from the Start Menu) This also renders half my Control Panel ineffective since .dll are the only ones that work.

So is there a probable fix for this, considering that all .exe cannot work?