A few possible ways?
Ctrl+Alt+Del > Processes > Right-click Folder lock process(es) & select 'End Process'
To stop it running running at boot-up: Start > Run > type msconfig & press OK > Untick it under the Startup tab & press OK/Apply > Reboot PC
If the above don't work, can he not just uninstall Folder Lock (FL)? G
P.S. Free & better alternative to FL is TrueCrypt click here.