Ah, so this is a different computer than your laptop -- I didn't get that point with the first post.
On the first half of your issue, does your laptop now detect your router with the SSID entered?
And now on the adapter problem --
You can run a virus check, but that is not a common symptom of a virus AFAIK, more likely an antivirus software issue.
Two things to do for the computer that will not allow you to enable the adapter. First open services.msc (with a right click run as admin you can find it by typing its name in the start button search box) and check that the entry for WLAN Autoconfig is set to automatic.
If that doesn't fix it then try the following sequence: disable any antivirus or security programs, uninstall the wireless device driver (you can do that in the device manager), reboot your computer into safe mode, reinstall the wireless driver, reboot your machine.