Dead Space could be lower (-75%), oh well. Might be worth another run through (beat 360 version). One of my all time favorites this gen, THEN I MUST PURCHASE.
Some SecuROM info: Reformatting will not use up an activation, as you have the same hardware. And upgrading the hardware in more cases will not disrupt SecuROM (eg, only a video card). If you are really worried about using an activation, you can revoke the licence before upgrading or switching...
Saw a few posts asking about this ... BF2 runs fine on 7 and (I assume) Vista 64bit. Although I've only personally used 7. Also, you must disable Steam Community Overlay in settings if you don't want to get kicked by Punkbuster.