How to run .php file on windows hosting server

I've windows hosting host in asphostportal.com and I've developed a php web application, when I'm hosting my application under root directory (web) creating new directory. When i try to access the index.php, it gives me error "bad server request" bla bla bla.

Please tell me how to fix this problem?

First thing to discover is if the hosting provider allows php programming on their servers with the type of account you have. If so there should be some kind of "control panel" application where you can configure it, and someplace to file support tickets if you have an issue getting it working.

Also there are php programming communities out there if you search. I would venture a guess only a fraction of the regular posters here do php. Your issue will be more widely read by those with that specific skill set in a php dedicated forum.