Win 7 PC will not allow other PC to read/write and others PC not seen

OK all the same now and all PC names show up in problematic PC, but no access to them and visa versa.

Sleep well speak tomorrow

The problems I see with Homegroups is that certain files build up under peer networking and they need to be deleted, these extra files will make certain machines vanish from the Homegroup or become inaccessible. The other symptoms are that you can't leave or join a Homegroup, this tends to occur most often with wireless machines.

You should be setting up the shares from the C:>Users folder rather than the C: drive. This is the default setting and it's safer than sharing the entire C: drive.

If there is any type of third party anti virus software installed then it will need to be configured to work with Homegroups or removed from the system using the special uninstall tool.

If it's the peer networking problem just go to the location listed in the picture and delete the files below the black line. It might be required to delete all the files in the peer networking folder but deleting the ones below the line seems to work for me. It will probably show more files to delete than in my picture.

Many other Homegroup problems can be fixed by going through the guide in the link. :)

Ultimate Troubleshooting Guide for Windows 7 HomeGroup Connection Issues - Help Desk Geek

All home-group entities are correct in all PC's as in above. All PC's can now see each other as far as there allocated names. But the problematic PC even thought it can now see all other PC's can't access any of the the other PC's in the network even though all Folders and Drives are shared and have permission set to everyone and allowed. The other PC's can access each other, but not the problematic PC.

Everything is up-to-date and only MS Security Essentials running

can we continue in a weeks time as I'm away

Found that after changing all homegroup names on all pcs I could get access.
Thanks for help