Hhmmm... did you select everything to install? Its going to to take way up to 6 GB for SuSE Linux 8.x Pro ;-)
Try 8.1 instead. Use default selection -> this will take approx 2 GB. It will dualboot with your windows nicely. My test harddrive was a pentium V with only 8Gig HD, 5Gig for windows the rest for linux (SuSE 8.1)
Have alot of fun! Oops "alot" means hard to cew :-D
Have a lot of fun!