msbadhan 0 Newbie Poster

Hi,
I have 10 computers in my office and all of them are connected with each other . We sharing files with each other and there is no problem to access other computers in office with networking printer.

In one of the PC we have installed a second network card 10/100 to access the internet.

Kindly note :
1. We have a DSL modem supplies by the internet company and connected with second network card with proxy setup. We have not using any firewall in this computer to protect any sites .
Problem:
All the 8 computers are able to access the internet but some of them -----
1. Not opening the most of sites.
2. Yahoo messenger is not sending the files and web cam is alos giving the error.
3. Norton anti Virus is upgrading and setup with minimum security.
4. Not able to use rapid share with flash get for download.
5. Video viewer for viewing our store security cameras are also not working.

kindly help me that how the yahoo messenger will work perfectly with all the functions. Where will be the problem, we have set in yahoo messenger (version 9) proxy in connection preference.

And also to see store security cameras without any problem

please guide me

thanks with regards