Function keys issue

Hello,

I bought a laptop recently(N5010) and it was 64 bit OS. It is not supporting SQL server. Later i came to know that 64 bit OS will not support SQL server so i installed 32 bit OS. Now few of the function keys are not working(f2, f4 and f5). With out these keys i'm unable to use Wi-Fi, reducing contrast and increasing contrast. Because of not reducing contrast, i'm getting just 1 hour of battery back up. I'm suffering a lot because of this issue for the past 6 months but i couldn't found any solution from any one. Can anyone help me to solve this issue...

Thanks in advance...

Thank you,
Sathish Kumar. C