If you go to this website :
http://esupport.sony.com/US/perl/swu-list.pl?mdl=PCVRS720G&LOC=3
You can see every driver for your model.
If you are unable to get online due to no Nic Driver or other reason I suggest downloading the Nic Driver from another PC and transfer it o your laptop by USB Thumbdrive or other media.
If you dont have another PC thats online, you can buy a USB NIC but only spend money if you have nobody to help you with this.
If you are not sure what driver to download because of multiple download options for the same part (aka Video) you can use a program like EVEREST that can ID hardware better than Windows can.
Just another suggestion, you should install your INF Chipset for the Motherboard first before any other Driver. Its always best to start from the bare level before just picking parts out randomly.
I will give you a link that will be help full
http://www.techsupportforum.com/hardware-support/driver-support/186276-sony-vaio-pcv-rs720g-no-drivers.html
please rate if i was helpfull
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