I recently did a system restore, and now my anti virus updates are gone! Please Help?

[arpa ray]

I have a Samsung netbook N150. Recently my speakers went off. Nothing was muted yet the speakers were'nt working. So i google-d in did a system restore as suggested by someone. The speakers started working but now, my Kaspersky Anti-Virus went off. It said 'databases are corrupted'. What should I do? Please help!