Ta for the input all. Rep fairy has visited, though she got carried away with the ctrl+v key and may have pasted half a comment here and there
I've got rid of this sort of thing before, but it's not something you can easily remove remotely and without Internet access to do research or download tools. It's the first time I've encountered something so stubborn and nasty though. My own system has various security measures so there's no chance of me getting anything nasty

Shame that others are so complacent. Would an AV scanner pick up spyware? I know f-prot for DOS will flag up and clean keystroke loggers.
I have accidentally deleted user files before now, so I've learnt to exercise caution
edit:
The OS is good old Windows 98 SE, no doubt unpatched, so options are limited.