Hi,
Did you get the question to allow VMware drivers in apple menu -> System Preferences -> Security & Privacy on the General tab?
It should have been there just under the "Allow apps downloaded from" section.
If you did allow the VMware drivers there already -possible as it worked before- then it is likely that your kernel extension is not getting loaded for another reason, a permission mixup of some kind.
In that case you can probably get past this by deleting the /private/var/db/KernelExtensionManagement folder and reboot. After rebooting and starting VMware the folder will be recreated with the correct permissions and things should start to work.
--
Wil
