Win7 32 to 64 backup

Hi, I have a computer only a year old that was built private it is running win7 32 bit now I have checked that it is able to run win7 64 bit and all says OK to do so, The disc I have for OS is in Greek (Live Greece but cannot read it yet) although it does show 32 & 64 written on the disc so I am guessing both options are available if I do a re-install. I also installed a second hard drive, can I use this second drive to back up my files in the machine because I believe you cannot overwrite win7 32 with win7 64 direct you have to re-install is this correct please.
Thanks.

Yup, you cannot upgrade from 32 bit to 64 bit, it requires a clean install.

In your position I think I'd install 64 bit on the second drive initially as a dual boot system. If everything works as you need it to on the 64 bit then you fould wipe the 32 bit OS off the second sdisc and use it as a backup.

I'm using MS Office Accounting 2009 for my business and was very irritated to find that it would not run on Windows 7 64 bit OS. I'm having to do my accounts on a old Vista laptop. Most frustrating.