Hi Thanks for all the helpful comments after my last posting. I ran WL for 4 hours yesterday and no slow down at all. Changes :- - Prevented ME loading programmes at startup. Especially Macafee Virus checking, Nikon camera programme, (Nikon View 4 and Fotostation) - changed the keying onto COM1 So far so good. I will keep you posted 73 Bob G3PJT