Some of key are not not working properly [Closed]

Registration date
Sunday July 14, 2013
Last seen
July 14, 2013
i have acer aspire 4736z . Some of keys like backspace , i , o , etc is not working properly . when i continue pressed these keys 8-10 times then its work for 1-2 time . and the funny part is it that all buttons which are not working properly are still work with shift like shift+i , shift+backspace etc ..

i tried both win 7 and 8 but its problem comes in both ..

is this a hardware or software problem ... Please suggest me what i should do to fix this issue

thanks in advance
Nikesh Kumar

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