Sony Vaio Vista Upgrade - 32 bit or 64 bit Windows 7?

Have just bought a used Sony Vaio VGN-NS10 L/S with VistA 32 bit. It is for my ageing aunt who can't get on with Windows 8 and I'm upgrading it to Windows 7 for her and putting a bigger hard drive and new ram in. It currently has 3gb of ram and I have bought 2 x 2gb modules to put in, so now have 4gb

Intel Pentium Dual Core T3200
Intel Graphics Media Accelerator (GMA) 4500MHD

Would it be best to put 32 bit or 64 bit Windows 7 on? I know 32 bit won't use all of the 4gb ram, but am not sure if 64 bit would be good with this hardware or not.

Thanks!

Thanks. Yes forgot to mention - all the Windows 7 drivers are available for both 32 bit and 64 bit, plus all the utilities are there for Windows 7 32 and 64 bit too.

As well as some 32 bit drivers for Vista. Why do you think I should stick with 32 bit?

Thank you very much maxie and Britton. The Processor is ok for 64 bit, I just wasn't sure about the motherboard and/or whether the graphics card might come into the equation. Laptop hasn't arrived yet - when it does, will run the tool. I just can't wait to get my hands on it, so am doing the research and decision-making until it gets here!

I see what you are saying maxie, and you are probably right - but it is why I am feeling indecisive, because 4gb could do either 64 bit or 32 bit. I thought if I found out part of the hardware might be an issue that would make the decision for me! But if it is no big deal to instal 64 bit, I'd quite like to use the rest of my RAM. Or is that just being picky?!

Thanks maxie - problem is - am indecisive about what is right! Hoping something will sway me one way or the other, the more I find out!

Try 64 bit you can always go back to 32 bit. If you don't try you will never know,if you want to add more ram at a later date its all set to go.