[Gooser711]

To reanable the USB to PC popup, try to open the program in Start -> Settings -> Connections -> USB to PC and click the box, "Ask me first about USB connection type..."

I don't have this exact rom, but the command to open the program is called, HTCUSBTOPCPopUp.exe according to task manager so you can look for that in the Windows folder if you can't find it above...