Bootcamp, left a "phantom" partition

Hi,
few months ago I used boot camp assistent to add a Windows partition on my Macbook pro hard drive, about 40 gb, I installed windows 7, I couldn't manage to restarte the computer in MacOSX (i didn't had internet access) and I din't know that you just have to press option at start up, so I did a "format c:", the day later I found out what to do and I used again Bootcamp assistent to erase the partition, but even if I removed the partition, my hard drive still "see" only 460 gb instead of 500 (by looking at finder and tech tool deluxe), my hard drive shoud be 500gb.

What should I do, to fix this, without formatting everything on mac and re-install all the programs.

thanks,