Long story short(ish): I have a PC that had Win7 Home Premium 64 bit and the C: drive got corrupted by Win 8 Preview that I tried to dual boot with. (My silly fault - I shouldn't have risked it on a good running computer - Especially silly since I hadn't done any backups for 6 months and lost pretty much everything new or modified over this time!). So I knew I had to start again and decided to go for Win 7 Pro 32 bit, because I would have liked more compatibility with some peripherals I have and software than I got with 64-bit Windows.
Well I have now decided that I don't like 32-bit its slow to boot and much more likely to hang, so I want to go back and emulate my previous 100% reliable 64-bit machine build.
The question is: Can I just use the old license key again (this is with exact the same hardware, or will the MS database have the new license on file for this hardware).