NIS 2012 has blocked me from my own website admin

I use NIS 2012 with windows7 on a desktop.

It has been working fine until today.

There was another website/ shopping cart on the same host server that apparently became infected with a trojan & virus.

When customers go into the ssl for checkout to buy something, they get a warning that my site is a threat.

 

I cannot even load the webpage and cannot get into the admin now from my own comp. any other page loads but not my own.

I looked for a way to unblock my site in Settings and found my site mentioned in the network security devices or something. I can't remember now.

The question is simply, how can I unblock a particular website that NIS has flagged on my machine and won't let me access?

 

Thanks