If your system runs on NTFS-formatted drives, then you can go this way:

1. Install it again, wherever you prefer
2. Delete one of the two installation folders, but write-down its full path
3. Download Junction[^], a former SysInternals' free utility, now owned by Microsoft
4. Create a Junction (friendly name for an NTFS Reparse Point, much like Unix/Linux/MacOS links) with the name of the deleted folder, pointing to the other installation folder

This should be enough...

Take a look at this site http://webster.cs.ucr.edu/ It's a series of free books, written by Randy Hyde, who teaches computer science at the California University. There are three books: general x86 assembly, Win32, and Linux specific stuff. You can also get your hands on a printed copy of the first one, through Amazon or other resellers. Otherwise, everything is available as freely downloadable PDFs. Hope it helps. Bye!