I can't to install in Window XP

I’m using Windows XP Home Edition SP3 with Comodo products:
-Comodo Internet Security Free
-Comodo SecurityEmail

When I try to install Comodo EasyVPN 1.6 or 1.5 I get the message the Driver has not ben signed, and click OK the rollback action installation occurs.

How to solve this.

Tks (sry for my bad english)

try to continue installing when the Driver has not been signed. Do not roll back the installation.

(:WAV) (:WAV) (:WAV)
(:WAV) (:WAV) (:WAV)
(:WAV) (:WAV) (:WAV)

The rollback action occurs automatic by installation software.