When I start the installer, it indicates I have 60GB free. In the middle of the instalation, it stops and says I don't have enough free space (600+ MB) in the destination disk/partition. I have 60000MB!!
I've tried to use the compatibility mode, changing the options (destination drive), etc. I'm using Vista (32bit).
What's the problem and how can I solve it?
(I posted it here because I've opened a support ticket a few hours ago and I didn't receive any kind of notificatio that my ticket was received)

this is happening in other games too, check the other games forums maybe you find a solution...

Try adding junk files of a few hundred megs each until the problem goes away. I believe some old games calculate free disk space modulo 2GB.