Downloaded Mod-packs Don't Work

[TylerWaugh]

Launcher Version: any

Operating System: windows

Java Version: 7u17 i think

Antivirus Program: n/a

Description of Problem:

when i download modpacks they wont work its like im playing vanilla minecraft

Error Messages:

no message it is just dosnt have any mods

Error Log:

n/a

[Richs_Yard]

Uh... This is no help. Which Launcher Version? What version of Windows? On a side note you should really get a AV.