You need to already have it running; two windows so you can see gtalk AND process explorer.
Also you didn't mention if you checked your drivers. Download and scan with
Device Doctor Don't actually install the updates but tell us if it suggests any please (I don't always trust that this program to point out and find the absolute best driver but it does give us a place to look and we have an expert in the forums that know what drivers are the latest).
Please also specify the make and model of your computer as sometimes updates are available from the manufacturer.
Also I would like to know what anti-virus software you run, as many programs have known problems including hogging resources.