Trial Software Won't run

["kmccamy" <webforumsuser@xxxxxxxxxxxxxx>]

I have downloaded both Contributre and Photoshop as trials and both downloads 
went smoothly, as well as installation. However, on both programs, at the 
screen that displays the option to enter a werial number or select the trial, 
when the trial is selected, I receive an error message that says "a problem was 
encountered when trying to load the trial period..." and only gives me the 
option of purchasing a serial number. Seems to me that kind of defeats the 
purpose of downloading the "trial" software.

 I am running Windows Vista w/SP1 and McAfee v. 12.1

 Does anyone know why this error occurs on both software programs (Photoshop 
and Contribute) and how to solve the problem so I can evaluate the software?