Bill:
I have checked the usage on my gaming computer here now. I use it only for
games and only have small, necessary programs installed. The OS is
installed on a drive separate from other programs. Total usage is
currently 14.5 GB. My home dir is taking up 2.3 GB so you can subtract 2
GB leaving you with 12.5 GB (I also created a new user account and logged
in to prepare it. It's taking up right under 30 MB). I have hibernation
(hiberfil.sys) enabled taking up 3 GB at the moment. Virtual memory is
disabled here which you probably *don't* want to do. But *if* I disable
hibernation as well, the OS with all the necessary drivers and things to
run my games is only taking up 9.2 GB. Add some more for virtual memory.
The system is updated, I have not tweaked anything (except for disabling
virtual memory), and I do not have any .NET redist libs installed. No junk
in there. I hope this will give you good idea.