You don't by any chance have a media keyboard that has a windows button disabling feature?
On my keyboard if I enable "cyborg mode" by touching the cyborg logo, all windows related keys stop working, so you can't accidentally exit full screen applications like games.
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My Computer
At a glance
Windows 7 Ultimate x64, & Mac OS X 10.9.2Intel Core i5 2500kCorsair Vengence 8gb 1866mhzNvidia GTX 770 OC
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Built by badgers!!!
OS
Windows 7 Ultimate x64, & Mac OS X 10.9.2
CPU
Intel Core i5 2500k
Motherboard
Asus P8z68 LE
Memory
Corsair Vengence 8gb 1866mhz
Graphics Card(s)
Nvidia GTX 770 OC
Monitor(s) Displays
2x ASUS LED 22" IPS
Screen Resolution
3840x1080
Hard Drives
240GB Crucial M500 SSD
120gb Corsair Force 3 SSD
1TB Western Digital
PSU
Corsair HX650w Modular
Case
Corsair Air 540
Cooling
Corsair H60 Push/Pull
Keyboard
Corsair K70/ Logitech G27 wheel
Mouse
Saitek R.A.T 9
Internet Speed
Too slow!
Other Info
AMD fusion E350N Home server-Windows Home Server 2011 (also made by badgers!)
2011 Macbook 2.4ghz Core2Duo, 4gb ddr3, 120gb Ocz Vertex SSD