Network Adapter not detecting networks. Please Help, Thanks

Hi,

This is for Windows 7. Earlier today my wireless network displayed an error reading something like 'There is limited or no connectivity'. I usually select the network and click Disconnect, before reconnecting again. However, I have not been able to re-connect today since there is a red X preventing networks from being found. I know that the wireless network is working for my laptop, so there must be an issue with my computer.

I have tried restarting computer, removing security from router, resetting router to factory settings, enabling and disabling network drivers, uninstalling and reinstalling network drivers. I have also tried several system restores, some of which did not resolve the issue and some of which did not complete successfully.

Your help would be much appreciated.

At the moment I am trying to uninstall network drivers and then restart computer. In my earlier attempt I uninstalled and scanned straight away so that Windows would reinstall them. I doubt this will work.

P.S Wired connection works fine.