Depends on your processor. Check to see if it is compatible on the appropriate site (Intel or AMD)
I hope you can find 64bit drivers for everything.

Seems so :)

Well, you could experience some problems 'later'. Either a device might not work or an application.

Devices require a 64 bit driver and not as many that have 32 bit drivers do have the 64 bit version, especially on older h/w, like printers and scanners.

S/W, mixed bag depending on what they do and if they exercise h/w directly.

I think you might be able to get a better answer if you run the Win7 Upgrade Adviser? It will possibly identify problems for you and even suggest if there are known workarounds.

Irv

AgentFleabag, if this was solved for you, please accept a answer, so the topic gets marked "Solved". :)

-Red

Just an extra note to add to this topic:
You cannot install the 64-bit version on a computer with a 32-bit processor so the fact that you were able to install it means you have a 64-bit processor which before was running in legacy mode while using the 32-bit version.