Ken,
The symptoms sound like the signal strength is weak and it keeps dropping out. How far is this PC from the router? What sort of walls are between them? Any nearby metal walls or roofs can cause signal degradation like ghosting.
What sort of aerial does the PC have? If it is inside the case can you attach an external aerial?
Does the lappy work from the same location? If the PC is under a desk, try the lappy there.
Can you pick up the PC screen with one of your webcams and broadcast it for one of the PC gurus to watch what is happening?
If it would be any use I can donate you a 100Mb switch so you can have multiple wired connections.
Andrew
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