I have an HP Laptop on which i had installed Windows Vista as my operating system. Now the problem is that when i turn on my system, after 30 minutes my number lock comes on and then on the right hand side of the keys it will give me numbers and symbols instead of letters. I can't take the number lock off without turning off the computer and taking the battery out. Can any body tell me that why i'm having number lock issue on my HP Laptop? Does any body knows about it? Kindly help me out withe above issue.