I've gotten the Z-STAR ZS0211-LF webcam working on Vista x64 with the zs211version2.zip driver posted here:
I extracted the install files from setup.exe and did a manual install from the device manager (on some tests the install fails the first time but works on the second). Running setup.exe seems to install the drivers properly as well.
Vista x64 doesn`t like this driver because it isn't signed (one reason for a Code 39 driver error), however it is "test signed" by the Windows Driver Kit. Both of the following methods worked for me, but the second method is on a test machine and there may be other updates that break it.
1) Vista x64 with SP1 installed :
Open a CMD window in administrator mode and run the following, then reboot:
bcdedit.exe /set TESTSIGNING ON
Unfortunately the desktop is now watermarked with "Test Mode" in the four corners of the screen, but the webcam works.
I`ve found a couple of rather inelegant methods of removing this but I haven't tried either of them:
2) Vista x64 without SP1 installed:
The following updates need to be uninstalled (there may be others that I'm not aware of)
Run the following command in administrator mode then reboot:
bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS
(the DD is not a typo)
(This method doesn`t show "Test Mode" in the four corners of the desktop)
No guarantees, and good luck.