Let me guess you have a 120 GB Hard drive..... (after a quick calculation) You have 16 GB free ...
Now here is the catch that MicroSnot dont tell you about.....
System restore KEEPS / RESERVES 13% of your hard drive space for its own usage (even though it shows as available).
You can EITHER:
1. Turn of system restore, so that your computer can use the other 13% of the hard drive.
2. you can free up some space (even if its just temporarily).
Hope this helps <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />