Corrupt files on network storage

Hi,

I'm using Norton Internet Security 2012 (NIS) and recently I have attached a network drive (NAS) to my home network.

When I copy files to it from my Win7 PC, most of the files become corrupt in the transfer...

When I disable NIS, the files are allright!!! This leads me to believe that NIS is corrupting the files...

 

I went through the documentation (Network Security Map --> changed to full trust), but I could not solve the issue.

 

Anyone out there with a solution?

 

Thanks.