Windows 7: for restricted use of internet

actually i have taken a net data card which is limited for 2 gb only so what i wish is to have some sort of freeware program or some setting in the firewall setting so that when i use the data card then only net can be used by only firefox and rest of the programs and updates cannot use the internet...... i have another option that i can connect to the lan network during 6pm to 6 am... at that time i want all the programs work and all the updates and other thing work.....
but when i am using data card then i only want that only one application ie firefox is allowed to use the network and rest all other program is blocked



it is to inform that i am using the avg internet security and my verson of window is win 7 home premium

Use this to do so.
NoNet - Prevent a Windows application from accessing Winsock functions

my querry is not related with winsock but still can that program help me to block all the unnecessary programs using my internet connectivity......( i want no updates.... no checking of newer version or any thing else except working with my firefox while working with my data card)

As long as you add each device, it should.

the above solution is not working for me any other solution please???

i have got the above problem solved myself by using a software named net balancer