Here is the software from the 760 I have available (the device is labeled as: 090926 KOREA MC760)... virgin mobile doesn't list it to download anywhere on their site. Just to be clear I make no promises or guarantees about this software I am just uploading it to help out. Here is the Jotti malware scan for the file:
»virusscan.jotti.org/en/scanresul ··· bfe6c150
If you are not willing to try this software you might be able to pop the MC760 into another machine and copy the software from the virtual cd to a thumb drive, then move that back over to the machine having problems.