Heres why, on the 29th August I would have been running Vista on this laptop for exactly a year. I have two partitions, one for my OS and one for everything else. At the minute my Windows 7 partition has a red bar underneath it, meaning im running out of space. I never got this with Vista even with the huge amount of programs installed along with a few GB of pictures, documents, music, videos, etc. Something which I have not much of in 7, definitely nowhere near the amount I had on Vista.
So whys it taking up so much space? My point is I had Vista for almost a year and I never was close to running out of space on my OS partition yet ive had 7 for a few weeks, its ridiculous.