ASUS X53SC Notebook few Keys not working

[whiteandblack]

I got ASUS X53sc laptop on 17/11/11. Nothing has spilled on keyboard and no accidental fall or shake. I unpacked & turned it on & went to BIOS to change boot priority to CD/DVD. When I pressed ENTER key it failed to work but Numpad enter key worked. After loading Windows 7 ultimate and all the drivers that came with laptop on the CD. I found out that BACKSPACE key, PLUS & EQUALS TO key and below it BRACKET CLOSE key, INVERTED COMA key and ENTER key are not working. I reloaded the all the drivers and windows too (now windows is updated to date) but these keys are still not working. All the function keys are working. Please help
Thank you

 

[perfectblue]

Send it for an RMA?

 

[whiteandblack]

I am thinking of the same