Faulty 16.5 engine patching, pls help!!!

Yesterday i got upadate on my nav 16.5.0.134 on 64 bit vista/sp1 os 

 

Since then i can't live update, LU error code : 8921,246

It states :  Unable to locate a valid norton live update server, pls run a full sys scan and try again.

 

I scanned my system 3 times already but no use.

 

 

I am sure it is due to 134 bugs, so how do i revert back or get 135 version or have solution for lu problem with current product?? 

 

p.s. I also tried turning my firewall off but no luck.