Douglas A. Tutty wrote:
Since in the process of upgrading you'll end up replacing everything anyway, it may end up easier and faster to just do a reinstall.
Since the gf is likely to install Windows anyway, you might try persuading her to leave a goodly chunk of drive space unpartitioned, and then after Windows is installed, you can go to http://goodbye-microsoft.com/ and install Debian from there on the unpartitioned space, without downloading/burning a CD image. Then she can dual-boot and have the best of both worlds, and not actually leave Debian behind completely. If she's the geek she seems to be, she might just enjoy the process for the nerdiness of it.
-- Kent