My Airport and Bluetooth are not working.

I have a Macbook Unibody late 2009 2.0GHz Core 2 Duo 4GB RAM. It came with OS X 10.5.8 Leopard.

My 250GB HD went bad. I confirmed that when I removed it and tried reading it on another Macbook (Air). So I got another HD (320GB this time). Sadly I did not have my installation disk, so I tried using the Air's (mentioned earlier) Mac installation disk. Of course, it didn't work. I even tried restoring from a backup (but that's another story).

I ended up installing 10.6.6 through a friends MBP (i put my HD in his system and ran the OS X installation on it, with his disk). Now I have Snow Leopard on a Macbook but I have serious issues.

I don't know whether it's something I touched ('cos I opened my system quite a number of times during this period), but MY AIRPORT KEEPS SAYING NO AIRPORT CARD INSTALLED, MY BLUETOOTH DOESN'T WORK AND ALSO ALL APPLICATIONS THAT NEED CAMERA (e.g. Photo Booth) CAN'T FIND IT! What do I do? This has really given me tough time with a lot of things I do on my system.