I only connect to internet to download mach3. After that it is in the workshop with no connection. Do0n't know how to put emoticons on here, but would have put a smile re. Stirlings comment. He is of course quite correct.
So would you recommend that I start again with a fresh installation of XP and install Mach3 from a memory stick? That would leave out the internet and anti-virus. Having said that, I had them on the old PC with no ill effect.
Gareth