Content Blocking

how t block exe ,zip and audio & vedio Files
i make content checking rules but when i apply it ISA Server block every
one web site.and if i make yu content cheacking rules then also same
problum .
i have
ISA Server with SP2 on
800 AMD With
256 Dim
40 Gb Hard Disk
20 For Cache
DHCP /DNS And two lan card 

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