I'm not familiar with Windows 7, but on my MSI Netbook (Windows XP) there is an Fn + Function key combination needed to switch on the numeric keypad, which is embedded in the alpha keys.
You will usually find the numbers are in blue to the right of the capital letters on the alpha keys, i.e. on my netbook M has 0, J has 1, K 2, L has 3, U 4, I 5, O 6, 7 7, 8 8 and 9 9.
You will need to switch to Numeric Lock mode to use the embedded Numerics and trying to enter Alt 132 can be a bit hit and miss as well as frustrating.
Good Luck, Peter.