OK, it's back up again. It went up earlier, but I was running it in the computer room whilst I went out, and had to move it back to the spare room just (apologies to whoever was 17MB through a 300MB-odd download when I switched it off; hope your FTP client supports resuming!). Anyway, the IP problems may be related to my router rather than Windows, so I'm still keeping an eye on it and can't guarantee that it won't flake out half way through a download.
Had a go at running an Ubuntu live CD on it to check hardware compatibilty, but the ancient CD-ROM drive in the computer won't read it. Bah.
@mr_a500 - Yeah, but it's a good zip file. Two Monkey games, Doom, Doom 2, Netscape, IE; think Word's on it too.