It's internet traffic; this line is swamped with "TCP SYN flood" whatever that is (and it was causing 100% cpu usage, without me doing anything! No wonder the PC was getting so hot?) but it's now under control (now I've actually got rid of Internet Explorer; "deleting" it in the usual manner does nothing but hide the icons! Software from
http://www.litepc.com/ does the trick) using a combination of Spy Bot (highly reccomended) Zone Alarm (ditto, both availble form davixen's link) and BlackIce Defender (which I got off a magazine CD ROM, but a google should find it).
Spy Bot is having trouble with some adware so I'm still looking for a total solution, and also a way of modifying my Win 98 partition (the "free" wares I've found so far only let one do a virtual exercise, or else only do something that XP does better) so if anyone has some suggestions, they'll be much appreciated!
I'll keep you posted on my own researches.