I think you may be trying to say that your start page is not opening maximizes. If so you can change the Internet Explorer window back to the preferred size by using either of the following methods:
Maximize the Internet Explorer Window
To maximize the Internet Explorer window, click Maximize on the System menu (globe on the left of the Internet Explorer title bar).
Resize the Internet Explorer Window
To resize the Internet Explorer window, move the mouse pointer to the lower-right corner of the Internet Explorer window, and then drag the window until it is the size you want.
Once the Internet Explorer window is the size you want, quit and restart Internet Explorer.
I hope this helps!
Brett M,
Windows Outreach Team