Windows 7 keeps freezing (but cursor still moves)

Windows 7 for mac never really gave me that much of a problem in the past, it was mostly just very slow.
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However, recently, it has started to freeze at random. The funny thing is, I could still move the cursor around, but nothing responds to my clicks - everything else is just stuck.

It happens very quickly too. Just earlier on I was adjusting ONLY the personalisation settings for the desktop background, and it got stuck again. Previously, I only opened My Documents and browsed and it got stuck.
I have to force shut-down (press and hold the on/off button on my MBP) and restart the whole Windows 7 system again, but it still gives me the same problem and I haven't even had the chance to open the software that I need to use (AutoCAD).

I'm currently on Windows 7 safe mode and have yet to identify the root of the problem.

Has anyone got an idea what's going on and how I can fix it?
Thanks in advance!

p.s. My windows partition for bootcamp has plenty of space left, it's my mac osx partition that's pretty full, do you guys reckon this could affect the windows side nonetheless?

Sounds like a classic case of a bad or incorrect video driver. Make sure you have the proper and the latest video driver installed for Windows 7. When in Windows 7 safe mode, run the Boot Camp software update to see if you can download the latest version of BC which should also contain drivers.

You didn't mention which Mac you have, but if you have a late model Mac, you should have downloaded a driver set from Apple and burned it to disk which should be used to install drivers for Windows 7. Did you do that?