I have tried to download the full version a few times today and it always freezes at 99% complete and said I have insuffecent disk space...but I have several gigs of disk space available. WTF?
Try defragmenting first, that will most likely take care of it. Also before you do that make sure you uninstall any programs you aren't using.
And 2 defragment it go to start->Accessories->System Tools->Disk Defragmentor
just lettin u know in case u didnt know where it wuz