i am using boost library.....and when compiling i am getting an error

Error 1 fatal error LNK1104: cannot open file 'libboost_thread-vc90-mt-gd-1_43.lib'

I have installed boost libraries....

any Help please.

Depends on your compiler/ide
If you are using VC++, go to Project > Properties > Config Properties > Linker.
Add libboost_thread-vc90-mt-gd-1_43.lib to the Additional Dependencies list
Make sure that you include the directory path, too

The same is true for most other ide's, just go to linker settings, and add the library