Vegas 12 stops rendering at 20%, how to fix this, error is indicated as:

Problem Description

   Application Name:    Vegas Pro

   Application Version: Version 12.0 (Build 770) 64-bit

   Problem:             Unmanaged Exception (0xc0000005)

   Fault Module:        C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.8387_none_08e793bfa83a89b5\MSVCR90.dll

   Fault Address:       0x000000005CC0E2ED Fault Offset:        0x000000000001E2ED

My system specifications are : GTX 780 Ti

Thanks for the help in advance