I'm sorry to keep bothering (or whoever answers) but I don't completely understand. I'm going to leave the new install alone, except to stick some files into a folder (don't replace them, just leave the old files alone?) The folder in the new install, is it

Computer>Local Disk>Program Files>Bitcoin

I forgot to put operating system down!

It's windows XP. I don't have the same directory as you mentioned. The closest thing that I have is C:/Documents and Settings/My name/Application Data/Bitcoin/ and  then I have 4 folders ('blocks', 'database', 'chainstate', and 'Wallet default config'. The other items in the bitcoin directory are '.lock', 'debug.log', 'wallet.dat', ''db.log', and 'peers.dat'.( For a total of 9 things) Will the new install know to query the old file names or do I need to change them or what?

Local Disk (C:)/Documents and Settings/My Name/Application Data/Bitcoin                     XP directory

Should  I copy the bitcoin directory, with it's 4 folders and 5 other things into the bitcoin directory? The Windows 7, 64 bit operating system put the new bitcoin installation thus-'local disk (C:)', 'Program Files', 'Bitcoin' and that bitcoin directory contains a 'daemon, and 'doc' folder, and 4 other things, 'bitcoin-qt' (an application)  COPYING and readme text files, and a uninstall file.

Local Disk(C:)/Program Files/Bitcoin                   Windows 7 directory

Thanks for the help. I'd mess with it myself, (usually no harm done) but I've made serious errors regarding Truecrypt and (scarily) with Bitcoin when I thought I lost everything (but I didn't)

The first thing I did was back up Bitcoin using the menu, it saved a file.dat (with my name for file). As long as I don't lose this .dat file, it's just inconvenience, correct?

I want to move my bitcoin client (version v0.80-beta) from a old ailing computer to my newer one. I downloaded the bootstrap.dat (blockchain as of an hour or two ago) and I copied the entire src file from my old install on my ailing computer. What do I put where so everything will work again?
Thanks in advance!