Hi there what exactly is the issue you are having? Windows 8 PC's and laptops run with no problem on the Virginmedia network. What I think the tech support meant when they said they don't support Win8 is that they haven't yet got the training inplace for their support staff to be able to help with Win8 issues, same thing happened when Vista and Win 7 first came out, Virgin (along with most other ISP's) only have the training inplace for the previous operating system it can take them anything up to 6 months to add support for new operating systems.
Are you trying to connect the Superhub (ok it's not so super)or are you using one of the older virgin cable modems.
What issue are you having with setting up the Wi-Fi connection?