Mine is 3.04 GB (Size;
Not Size on disk)
It has 17,429 files and 840 folders.
But these things slightly vary as u install some extra drivers or some softwares (cause they have a few files here, not many)
Oh ya, mine is
win xp sp2 version 5.1 and build 2600 if thats of any help. (i dont think that the non bold part is of any use yet if anyone wants it ....)
Also the space of the windows folder or the total space consumed on your hd only affects your startup and shutdown times (initially). But as your pc's hd gets full (and i mean nearly full) yes then it affects even the running speed of your pc.
This is what i have noticed