Ok, these days nothing is going like i want to go so neither do Backtrack 4(final)!

1.problem: I recently bought new USB dongle Linksys WUSB54GC v3 than i find out v3 doesnt have RT73 chipset it has RT2870 chipset which is not supported :@ so now i need one good advice what to do i Googled a lot almost 4 whole days and didnt find anything what helped me and there we get another problem

2.problem: When i download some driveres that are supposed to work and try to update them in Backtrack everything goes well until make cmd when i type make i get this

make: *** /lib/modules/2.6.21.5/build: No such file or directory. Stop.
make: *** [LINUX] Error 2

and than everything stops i rly dont know why is this missing or how can i repair it pls advice me i didnt find anything on google i tryed kernel.lzm but i dont think i had success!
I am rly pissed of these days cuz uf that pls guys help me!!!