If you still have the original packaging, the drivers were originally distributed on a included with the communicator. This disk contained the necessary synchronization software and potentially specialized USB drivers for different Windows versions available at the time (like Windows XP or Vista). RoverPC N6 technical specifications - GSMchoice.com
To ensure you are looking for the correct software, verify your device matches these specs: Windows Mobile 6.0 Professional. Processor: Marvell (Intel) PXA270, 416 MHz. Memory: 64 MB RAM and 128 MB Flash ROM.
The most comprehensive resource for this specific device is the RoverPC N6 FAQ and Discussion on 4PDA . This community-maintained page often contains links to mirrors of original driver disks, firmware updates, and synchronization software.