Not really an MW2 question...

I have Vista 32 bit

I have this program called windows7update or so from windows, but if I update it, will it be free?

(Will windows 7 be free for me)

When did you buy the PC?
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If you bought Vista after 1st of July 2009 youll get free windows 7 update.

if u cracked you win7 dont update that. just remove that update