Display issues when logging in

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http://askubuntu.com – I have installed Ubuntu 12.10 on my PC alongside Windows 7 option. All seemed to be working fine ; I installed Chrome and Filezilla, installed updates which had downloaded during the install, rebooted, and i get the usual boot options (Launch Ubuntu, Ubuntu with Linux, memory test, and boot Windows 7 on SDB1). Booting into Windows 7 is fine. When I select 'Launch Ubuntu' it proceeds to the log in screen. However, when I enter my credentials, I then have display issues. The screen becomes smaller, leaving a black border around the screen, almost as if I'm using a lower resolution than my mon (HowTos)