If it works.... I'd ride that horse.
As long as mine works and does what I want.... I'm good with 32bits. When it dies, then we'll be looking at the new 64 bit.... well, it'll probably be 128bit by then....
On the c drive thing... I had a C drive crash on me on a different computer. (2 diff times)
On the first one, the boot sector was damaged some how.... I installed a new drive installed the OS and then took the old c drive and connected it as a slave drive.... back in the days of jumpers.... I was able to read the data on it and salvage/copy/paste the files out to another drive.
On the second..... the drive didn't hard crash, but was flaky and would boot sometimes and sometimes not.... so I got a new drive and it came with some cloning software.... I followed the instructions to the letter. Literally 15 minutes later, I had a fully functional new C drive which was a clone of the old one. I only had to reinstall 2 of the applications, everything else cloned and ran perfectly.