virus database update fails.

Hi all,

New to the forum.
virus database update fails. found topics similar, tried the solutions. like manual update, command line, safe mode, reinstall etc. nothing worked.

Verison of CIS: version 3.11.108364.552
Virus Signiture Database Version: 1

1)installed CIS first time. updated virus database. successful.
2)got a bases.cav file - size 103,823kb.
3)got a message: “you need to restart your computer for the signature updates to take effect”.
4) after restart bases.cav file back to original 4,546kb size and update status: “never updated”.

Locked because of double post.