Thanks for your response(s). In case you are interested - unfortunately, Search Companion has also decided to go AWOL, I get a message saying that I may need to run setup to get it back, can't face asking that question yet: so I rang Dell to see if they could tell me where to find this sr.sys file on which disc. I didn't get the answer. He wanted my phone number in case he wanted to phone me back tomorrow! Wasn't after a date, India's a bit far to go. Anyway, he did say that if a virus has got into the computer I have to reinstall the whole system, from scratch, can't reinstall bits - and as I have Windows 2000 loaded onto my computer, I would lose all that - and incidentally, they won't help due to me having downloaded Windows 2000. (I find XP not good for WP purposes.) He then said he would put me through to the software support team, who for a nominal fee would help me reintall this file - does this contradict his earlier statement or am I now going crazy? I'll let you know if I find the magic file; if I can install this bit; and how much a new computer costs in the UK today, 'cos I reckon this is the end of the road for me.