Running right now 32-bit Windows 7 Ult. Comes with Original Windows Vista OEM (Comes with all dvds , backups etc..)
64bit compatible - Yes.

So it has a Intel Dual E2200 @ 2.20GHz
4 GIGs of Ram ddr2
Ge force 8300gt (VGA, DVI)
16X DVD+/-RW Drive
500 gb WD Cav
(SATA)
Integrated 7.1 Channel Audio

And its a nice lightweight case in silver looks great