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64-bit.
You'll be able to use all of your 4 gigs of memory, you can add more without an OS re-install, and it's more secure and stable, due to ASLR and mandatory driver signing, respectively.
Were there any specific apps you were concerned about?
Sounds like you had your answer already. If you want to use all your system memory, you'll need Windows 7 x64.just wanted to not gimp myself by purchasing the 32bit by mistake.
You can install Win7 without any CD-Key (trend started back in Vista days...), by the way. The setup will insist that you should enter the key, just choose that you do not want to. (There absolutely no difference if you install with CD-Key or not.)So my friend goes to his local Bestbuy Store in Emeryville California yesterday 12-21-2009 and pays $219 including taxes for Windows7 Professional. He hands it to me (still shrink wrapped) to install on a new system I'm building for his automotive shop. We decide on the 64 bit version. All goes well until I get to the cd key entry. He's standing next to me and closest to the keyboard, so I ask him to input the key and select next...bam! invalid key error come up on screen. I figure he's mis-typed the key, so I delete the characters and re-enter. Bam!...same error message. I call Microsoft's support knowing darn well, we can't take it back to the store, as they won't take opened software. The MS guy is rude, but in the end he verifies that the key is valid. He will not, however, hear the rest of my concerns about the fact that they're not going to take the software back and exchange it. He basically hangs up on me. I dial BestBuy to report the issue. I hold the handset for ten minutes with no answer. I then put the phone on speaker and let it ring (just to see how long it would take to get it answered). During that hold time I am able to put the entire computer together and do full cable management. Nobody answers the phone in that length of time. I try the 32bit version... It loads and accepts the cd key with zero issues. I suspect the disc got switched somewhere on the packaging line. That's the only plausible explanation I can come up with. If you can't load your 64 bit version of Windows7....send me my cd....lol