Ad-hoc wireless network SUDDENLY STOPPED WORKING!!!

I linked my laptop (Win 7 RC) with my girlfriends (Vista Home Basic) via Ad-hoc wireless networking, and it ran like a dream for a week. We took it in turns being the one plugged in at the ethernet, and the one with their feet up on the bed enjoying the comforts of wireless technology.

Then one day the ad-hoc networks were showing up as local-only.

Regardless of what I do in the settings, turning ICS on/off, disabling/reenabling adaptors, drivers, tweaking this and that, I can't get the ad-hoc network to share the internet, even though the ICS is shown as on

I've searched google quite thoroughly and found lots of cases of people suffering from this problem, but not a single solution. I suspect its a Vista bug they never ironed out.

I am now going around the forums posting this in the hope that someone knows what is going on and can help me. I really want us both to be able to have net access.

Please, please, please help. Very grateful if you can.

P.S> I am an IT professional, just so we can avoid the obvious questions. I just don't like to have to reinstall every 5 minutes, and am really hoping that Win 7 is the OS to break the Microsoft mould of making those reinstallations so frequent.

so did you find a solution? Cuss im soo frustrated that it doesn't work, i've spent the whole day reading forums trying to get my laptop to connect to the internet through ad hoc...

No I have not found a solution. My conclusion is that there are bugs in both Vista and Win 7 RC which periodically lead to this.

Basically I find a temporary workaround by going onto the 'host' computers NET CONNECTION (the one you are using to connect to internet - in my case an ethernet). Go to sharing and disable ICS.

This sometimes works for days, but I have since encountered other problems, such as the connection being made and then dropped, and all sorts.

I'm sick of it.