Homeplug Networking Problem

Hi!

I have O2 broadband which, to date, I cannot fault. I was using a homeplug system to connect my pc (XP Pro) and PS3 which were running without issue.

A couple of weeks ago I bought a new pc which runs Windows 7 64 bit and that connected fine both wirelessly and via the homeplug. Mysteriously the connection went down overnight and I spent hours on the phone with O2 trying to resolve the issue. Eventually they sent me a new router as it seemed inconceivable that 3 homeplug units could all fail at the same time (the wireless had also become unstable)

The pc running XP Pro I wanted to relocate upstairs, the one with Windows 7 I want downstairs. However, even with the new router I cannot get either of the pcs connected by the homeplug network. The Windows 7 pc will connect if I use an ethernet cable directly to the router, and will connect wirelessly, but I don't want to keep the pc where it currently is and prefer not to connect wirelessly (I want a stable connection for online gaming) and I don't want trailing wires. The XP Pro pc (upstairs) has no wireless card, but I would still prefer the homeplug system.

Any ideas please?
Thank you in advance
Cathy

[Admin]

My limited understanding of the Homeplug ethernet over mains system is that one faulty unit can cause the entire network to become unstable.

I'd recommend eliminating one of the PCs for testing purposes, then work through all the combinations of Homeplug units to identify if any one of the three is causing the problem.

I hope this helps.