If you want to know, which BIOS version is installed on your system, you can use the "System Information" tool from Microsoft to check it.
Windows 7 / Windows Vista
You can watch this "How To" as Video, too. Click on the Picture below, if you want to watch the video.
Click on "Start"
Type "msinfo32" (1) into the Search field and click on "msinfo32" (2)
"System Information" starts and you can see the BIOS version (e.g. 1.20)
Click on "Start" --> "Run"
Type in "msinfo32" and press "OK"
"System Information" starts and you can see the BIOS version (e.g. 1.70)
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