how to use arduino gsm shield with computer(windows)?

im a beginnner.I want to use gsm arduino shield with computer(windows) via usb.
is there any possibilities? any adapters which can convert TTL to USB?
gsm shield has tx,rx,5v,gnd separate pin. i know usb also has same pin configurations data0,data1,vcc,gnd.
can i solder these shield pins directly to usb pins(port) ? is it possible? does it work this way?
or any other possible ways to do?
i have attached arduino gsm shield picture.
Kindly suggest.

index.jpg

is there any possibilities? any adapters which can convert TTL to USB?

Yes.Buy a FTDI232 USB/TTL converter and wire it with the modem

can i solder these shield pins directly to usb pins(port) ? is it possible? does it work this way?

No. it will not work that way
You could use the arduino board to to this.What arduino board did you have?