Here's another series of commands to try (all as administrator):
- cmd prompt> netsh winsock reset
- cmd prompt> netsh int ip reset
- cmd prompt> ipconfig /release
- cmd prompt> ipconfig /renew (just listing this for completeness)
- cmd prompt> ipconfig /flushdns
You can try reinstalling or updating the PC's wireless driver through the Device Manager (Update Driver on the Driver tab for the wireless adapter) or if you can locate the latest network adapter driver software on the manufacturers website.
When the PC doesn't connect, you can try disabling, then re-enabling just the wireless adaptor.
See if you can find a local network expert to take a look at what your pc is doing. Without being able to put my hands on it I'm just going to be shooting in the dark at this point.
That doesn't mean I won't try.
