Try unplugging the usb out of the usb port and then start MPT once it asks u to plug your phone in then plug the usb and select scan (or wichever option it gives u),if this doesn't work then u have to install the phone manually, to do this u need to click SETUP, INSTALL NEW PHONE (or is it connect new phone) then u have to select
GSM (I think that's the phone a
gsm one if not then select the correct one on the list) after that it will install the drives and it should work. If those 2 steps don't work then uninstall MPT and reinstall it. If none of this things work then I'll post a link for a diff software which does the same as MPT but I'm just waiting for the approval of a moderator to post the software.
