I understand the CPU does not meet the minimum requirements, but is it completely unplayable? I can handle low-medium settings. I have a Pentium D dual core 2.8GHz (from a Dell Dimension E520) running Windows 7, recently upgraded GPU and 4gigs of ram.
Pentium D cpus suck pretty bad. They were not even able to compete with the dual core Athlon 64 X2 line, and in some cases, even a single core Athlon 64 could run circles around a Pentium D. Time to upgrade probably.