The Sims 2's EA games folder

The Sims saves are not in C:\, but are located in My Documents\ . I believe transporting your saved sims and neighbourhoods are a simple matter of copy/paste, provided you have a valid Sims 2 installation on your recipient computer.

However, simply copy-pasting the game installation directory to another computer may not work - several configuration changes and registry additions would invariably be made during installation.

Best thing to do is reinstall Sims 2 on that computer, then copy the saves to your \My Documents\ folder on that new compuer.

Jam it back in, in the dark.

You should be set. Guaranteed!

In fact, I never put My Documents in Drive C:. I partitioned my computer HDDs as follows:
Drive C: 12 GB (System, Installations)
Drive D: remainder of primary master, after Drives C: and Q: (all data, including Mydocs)
Drive Q: 4 GB (Temp, Internet Cache, Page File)

Any additional slaves/secondary primary drives are used as storage for movies and music.

While reformatting is still quite a chore, at least the fear of erasing all your files are gone. (On that note I should look into getting myself Norton Ghost and setting up a standard 'clean' installation of Windows, together with essential applications )

There's nowhere I can't reach.