just for clarification:
The first thing I did was:
C:\Program Files\McAfee\Solidcore>sadmin enable
Please install a valid license first.
what does sadmin license list give you?
Having same error condition.
When I run sadmin license list I get no response (blank)
This issue occurs after uninstalling SC 6.0 and installing 6.1.
SC license shows as valid in ePO software applet.
Here's the solution from McAfee Platinum Support:
Use the SC Enable task from epo. This will do several things such as:
1. Insert the license key.
2. Reboot system (full feature activation)
3. Solidify system.