I have finally found working Conexant Audio and Modem driver(Vista x64) for Gateway Laptop 7510gx. Its on HP website, One can download and install it manually following below steps.
Unzip the downloaded file which includes audio and modem drivers folders
After that go in to Device manager, right click on Multimedia audio device, click on "have disk" and point the installer to audio folder. If at all you get a message saying something about compatibility than simply ignore it.
You will have to follow same steps for installing modem drivers.
Note - Sound won't work after waking from sleep, i am looking after a fix for this and will post back as soon as i come across one.
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