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it is HP Laptop.. 3yrs old.
some times there is no problem. if this thing happend, i used to restart the system..then it will be ok..
this found, not in all the keys..expecially right side keys...

i am using vista in my laptop.
now a days, sometimes typing, unknown or irregular letters are coming..
like, when press 'p' it shows '3', when press 'k' in screen it will come '\'..etc.
expecially...

when i am typing, some keys are showing different letters. but, after restarting, it will be perfect..
for example: when i type 'd' it shows '3',
'f' - \
'p' - 5

why this happend..?

my...