Ried - thanks for all your help. You're a star.
I didn't load SpywareBot so it either came with the PC or got in some other way. I'll fix it as instructed.
I did have Smitfraud loaded following advice form the guys at McAfee. I'll delete that as well.
Once again - thanks for your patience and for the advice on the software - I now feel confident to use my machine to make a contribution to the cause! Well worth it!
Take care
Kind Regards
Steve