I can only use the computer if I press 8 and select "DISABLE DRIVER SIGNATURE ENFORCEMENT". Without this, the system comes up OK but I do not have access to the keyboard and mouse. If I select any other boot option the system boots up but I am unable to login since neither the keyboard nor the mouse is working.
The Device Manager is clean. All drivers work and have digital signatures. I tried to use local group policy editor to disable digital signature enforcement but was not able to make any difference. The OS is 64-bit Windows 7 Professional with Service Pack 1 and latest updates.
The system includes a WD USB 3.0 card, which I have been using for over 3 years without any problem. I recently (3 days ago) updated the WD SmartWare for Windows software. It seems that my problem coincides with this update. Since then, I removed WD SmartWare and Installation software and restored the Registry to its previous restore point however the problem still exists.
Does any one know what might be the problem?Thanks,
DC
