Okies....soooo....do i stick the Vista CD in the drive when I am in Windows XP, and run Setup like I did the first time?
And then select the G:\ Drive to install?
Yes, that method will work.
I can lose all the installed programs etc. , no problem. I just can't be reformatting the G:\ drive.
And then...what about my product key? Would that still work in Vista 64?
If your CD has 64-bit on it, then yes, it will work. If you go out and buy a version of Vista that has 64-bit, then that product key will work.
And..another question...is it worth moving to Vista 64? I have 4GB of Ram in my machine, Quad Core 2.66Ghz, two 8800GTX cards...it's a fairly nice system, two years or so old. But would I really gain Security and Stability from Vista 64? This Spyware experience has me never wanting to go through that again.
There are some people here that will swear by 64-bit, and others who despise it. I would personally recommend it because of the performance increase. here
are some arguments against an upgrade to x64, and here
is a mostly positive review of one person's upgrade experience.
Any tips on the method for doing this particular installation so that I don't use any data on either drive?
You will need to back up the data on the G:\ drive and format it to do the clean install. There is no way around this - it is the way that 32-bit to 64-bit works.