Quick check Win+Tab, Win+P, Win+L and Win+R - are they also not working?
Now check Ctrl+Alt+Del, which should bring up the Windows Security screen (menu), and Ctrl+Shift+Esc, to open Task Manager - are they working (malware test)?
Hit Shift 5 times quickly - is Sticky Keys working?
Now reboot the computer, and test again.
Go to Microsoft KB216893, and do NOT run the "fix it" (XP). Instead, go halfway down the page to "Let me fix it myself", run
regedit, and see if the following key exists there:
- Type: REG_BINARY (Binary Value)
00 00 00 00 00 00 00 00 03 00 00 00 00 00 5B E0 00 00 5C E0 00 00 00 00
- That value disables it, you would remove the key completely to have it work normal.
Then check this key as well while you're in there:
- Type: REG_DWORD (DWORD Value)
0 to disable restriction, or
1 to enable restriction
Check for other software running. Do you have any AutoHotkey scripts running? Do you have any shortcut programs running, like special launcher software, or special mouse or keyboard or touch drivers/software? Temporarily stop that software in Task Manager, and/or temporarily stop the services that it runs on. Or disable the driver, without disabling your last input device, and test again.
I also wonder, because the Win key can mess up a game pretty badly, maybe some games have ways of disabling that while they are running?