I'm not sure how to do what you want with webmail as the default mail server, but I downloaded Windows Live Mail and incorporated it, along with my ISP email account into that. Now I can check both email accounts from the one program.
Download and install Windows Live Mail then click on Add Email Account, enter your google username and password and enable IMAP from the Settings Forwarding and POP/IMAP tab on your google mail web page, then click finish.
I found it quite straight forward.
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