Can't acses any packs

[Anstarmus]

Launcher Version: 378

Operating System: windows 7 toshiba

Java Version: 7 build 45

Antivirus Program: avg

Description of Problem:

I start a pack downloaded or not and wile starting up it stops and gives me an error report

Error Messages:

Error unzipping a file for the folowing pack:

error in opening zip file

pleas consult modpack athor

Error Log:

[Munaus]

You didn't post any error log. The only problem I see is your antivirus, uninstall it.

If that doesn't work then you will need to read the Common Problems sticky.

[Anstarmus]

You didn't post any error log. The only problem I see is your antivirus, uninstall it.

If that doesn't work then you will need to read the Common Problems sticky.

I haven't had a problem before this.