Hi,
Can you please clarify and follow the steps suggested below,
What is the version Windows 7 is it 32 bit or 64 bit Operating system?
Did you had any issue with spyware alerts or pop ups in the system?
Can we have the MVT session ID number?
How do you connect to the internet (DSL, cable or wireless)?
Steps:Basically “Detection signature file outdate” issue may occur due to malware infection or network issue.
Make sure the system date and time is matches your local time zone.
Try to run the free versions of Malware removal tool:
http://www.malwarebytes.org/mbam.php clean anything it detected.