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Fn+F4, Fn+F5 keys not working, unable to adjust display resolutions

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The Fn+F4 and Fn+F5 keys (to adjust brightness) is not working in my laptop. It was working perfectly fine till yesterday.
But then, I reinstalled Windows7 due to some software issues, & I'm having this problem now.
Not only this function key issues, but also, I'm unable to adjust my display resolutions.

Somebody here, PLEASE HELP!!

My laptop - Dell Vostro 1550
OS - Windows 7 (64bit)
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