I have been trying to download vista kb968389 but I think I have a virus . Any help lpease

Why do you think that?

What happens?

Have you only tried using windows update?

Try installing MalwareBytes:

Malwarebytes.org

You don't need to purchase anything from them. Just click the "Download' button on the left of the screen.

After you install it, make sure it's updated and scan. It's (by far) the best malware eliminator out there.