From the right edge of the screen, swipe left to display the charms menu.
If running Windows 10, skip to step 3.
Tap Search .
Enter msinfo32.exe into the search field.
For Windows 10, press and hold the Start icon for 2 seconds, select Search from the list and enter msinfo32 into the search field then skip to the note in step 5.
From the search results (located below the search field), tap msinfo32 (located in the top-left corner, under "Results").
From the "System Information" window, view the "BIOS Version/Date".
For Windows 10, while in the "System Summary", look at OS Name listed in right panel.