Turning off offline files doesn't recover the disk space

Hi,

I had offline files enabled on my laptop and when I first enabled it, Vista
took 20% of the disk for it (set aside I guess, I found the setting for
adjusting that percentage).

I didn't have any use of the sync anymore and disabled offline files. I
deleted all the files too, but to my surprise Vista didn't give me my space
back

I can't find any settings for turning that thing off - permanently..
I googled it and realized that all the synced files resided under
%SYSTEMROOT%\CSC and tried to remove all the folders there (in safe mode) -
not even that gave me my space back...

Is the 20% a non refundable signup fee?^^

I'm sure I missed something - can any one help me?