My PC came with 7- 64 . I dont like it much because many programs are available for 32-bit and not 64-bit. But that seems to be changing - i saw 64 bit versions of eclipse,
tomcat, etc.
PS : The windows 7 has this wierd UAC , it puts irritating restrictions on installation and execution of software but not on malware, one of which had bypassed UAC and attacked silently. IMHO,
you should not upgrade if all you do is "basic work".