Win2K Pro Upgrade Problem

When I try to upgrade Win2K Pro on a PC with Windows 95 I get the following error:
“page_fault_in_nonpaged_area
Address BFFC41E5 base at BFFA2000, DateStamp 38441c2a – setupdd.sys”
I swapped RAM, but cannot solve it.
I upgraded another PC with the same hardware configuration with no problems.
Any ideas?