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Thanks vehelpfulguy, I had not thought of it this way, I've had AVG for several years with no trouble, but it did seem odd that the day after he put it through a full check that the problem arose. I do have a spyware thingy, can't remembers it's name, but it pops up as a spiky little green man that fills in your name an address. Could he be the culprit?
No idea how to install Adaware or Spybot Search, so will wait until James gets back from Uni next week, half term, unless you could talk me through it, albeight very simply. Many thanks for taking the trouble to reply.
Judy