i have installed 80 gig SATA hard drive

i can only acess 5 gig in windows

Have you gone into disk management in windows and checked if there is more space that is 'unallocated'?

What is the brand of your hard drive?

if you cannot see the rest of your disk in disk management then I'd make a bootable cd with ranish partition manager on it. booting from the cd should show you your hard drives and all partitions on them. It also lets you manipulate them. but be careful, changing your system partition will probably destroy your install of windows.

http://www.ranish.com/part/

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