W7 can not count... bug!

[Focus]

W7 installed with my old stuf in a Windows.old directory.
I didn't need anything from it, so I deleted it. It was about 90 GB, but W7 was counting..... 29 TB!!!
I don't know where that came from, since neither the number nor the TB was correct. Also it deleted almost everything, but it left the directory and some small stuf in it. I had to delete it a second time. Strange for a RTM version...