If you absolutely cannot get the 64-bit driver to stabilize, the most reliable workaround is to run a using software like VirtualBox or VMware Player. You can pass the PCIe/PCI device through to the virtual machine, where the native, highly stable XP drivers will work flawlessly.
Do not download from random "driver download" websites. Many EXE files claiming to be "TW6802B Win7 64-bit hot fix" are malware. Always scan with VirusTotal. dvr card techwell tw6802b driver for win 7 64 bit hot
Look for the unified TW68XX Device Driver v.1.2.0.0 (or newer compiled packages). These packages bundle the underlying structural setup files ( TW68XX.inf ) needed for Windows 7 to properly talk to both the video and audio streams of the card. If you absolutely cannot get the 64-bit driver
The hot driver sometimes maps channels incorrectly. Open the DVR software and manually reassign video inputs. Or edit the .inf file: find [TW6802B.AddReg] and change ChannelMask from 0x0F to 0xFF . Many EXE files claiming to be "TW6802B Win7