I must protest, I am quite used to doing battle with Win7 to enable network compatibility so after making all the usual adjustments to the local security settings I was rather stumped when I could not make a computer at work see or interact with my Samba server or several other PCs, sum could be seen but not networked with. Anyway spotted the LMHOST tick box and unticked it - hey presto! works fine now and I have added it to my things to check on Win7 computers.