Quck question - how much hard drive space required for windows 7 professional 64 bit?

Set asside 20 odd GB. 80 is fine though using old hard drives isn't the best idea if you are going to rely on them for important stuff!
 
You need 40gb for Vista / 7 64bit, I'd say 50gb to be comfy (office etc)

The windows updates make it expand quite quickly
 
I'd agree with bledd. - Windows 7 (and Vista) are huge!

I had a 30GB partition for Vista and it wasn't enough - Windows 7 is currently on a 50GB partition and it seems to be fine (touch wood!)
 
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