Hi tymarski,

I did a quick google search and came up with this website: http://ask-leo.com/a_cabinet_file_cannot_be_trusted_why.html

It's got a few suggestions but i think your best bet is the following (from the website):
Under Windows XP, ensure that the Cryptographic Services are enabled and running:

Right-click on My Computer
Click on Manage
Expand Services and Applications
Click on Services
Right-click on Cryptographic Services
Click on Properties
Set the Startup type to Automatic
OK and close your way back out.
This service is required for the validation to work.


Let us know how it goes.