How to correct corrupted download?

A user attached this picture: http://www.kepfeltoltes.extra.hu/files/CAVupdate.jpg. How to correct this problem? Is it enought to delete Temporary Internet Files? Shall she delete anything else?

“Error number: 201
A required file is corrupt”

Thanks in advance!

At that point the program is either checking the validity of the server update file or is checking the validity of the current antivirus database.

I will ask around to see what is going on with this.