[QUOTE] Will it simply install "on top" of XP, or will I have to empty everything else (important) off the C: drive first? I was rather hoping it would free up the 128Gb of disc that XP refused to acknowledge first time round.[/QUOTE] I did XP to 7 a couple of days ago on my netbook. There's a nice utility in the installation which backs stuff up to an external drive and restores it afterwards, which handles software settings from e.g. MS Office very tidily, as well as data in places Windows knows about. The installtion doesn't clear your C: partition, so anything you've put elsewhere will be OK. All rather painless really, although you'll have to reinstall all your software.