Vegas?
I find so often that a person, will put a program on their PC and then think "That's it! I'm safe!" and nothing could be further from the truth. I see this almost every day in my own computer service business.
K-Lite Codec Pack is like an AV program, they are updated weekly. So anyone wanting to keep their PC up to date and running smoothly, should make sure that all their Service programs, like K-Lite Codecs, Shockwave, Flash, Java, PDF Readers, Anti-Spyware and Anti-Malware software are kept up to date.
I head off many possible problems on my own PC and the PC's of my customers, by installing the very latest update to all of the above mentioned programs.
I visited one little lady one day who had computer problems. I was glad to see that she had Spybot Search & Destroy on her PC, but then I was horrified to find that in over two years, it had never been set up properly or updated and NO scans had ever been run.
It was just sitting there on her hard drive, like a mushroom, doing her NO good at all.
I reinstalled the program according to my custom setup and got the updates, ran the Immunization and a full scan and took out over 200 pieces of Spyware. She still won't turn her hand to do anything for herself, like getting updates for the program or running a scan.
I do that when I go there about every six months or so for a tune-up.
If it were not for AVG 2012 FREE , getting it's own update and running its own scan every day, she would have no protection at all.
I said all that, to say this, 'Make sure all your update-able programs are at the highest level.'
Cheers Mate!