I am VirtualBox on windows 7.
The VM has Ubuntu32bit (latest version) running.
I am unable to maximimze the Ubuntu window.
Here's a screen shot of what I see:
Please, please go easy on me! I'm a microsoft guy, and JUST started with linux.
As fossfreedom indicates in a comment, it is better to install the Virtualox Guest Additions first. See this question to do so: How do I install Guest Additions in VirtualBox?.
After that, if you still have your problem, try changing the resolution of Ubuntu inside Ubuntu:
here's what worked!!