CyberGene
I do hope this will be solved quickly for you!
I use iLock (for VI Labs and Acousticsamples) under Windows 7 without any problems, my brother uses it as well for several VST synths under Windows 10. No troubles for him either.
Just to make sure: before uninstalling and reinstalling, did you remove your license(s) from the computer (back to the cloud, so to speak)? So: unregister the licenses, uninstall everything (iLock manager, UVI Workstation), then reinstall UVI Workstation (which, at least on Windows, automatically installs the iLock license manager with it).
It's just a hunch on my side, with a tiny hope this may help.
Cheers and good luck,
HZ