The correct way to open Windows in a maximised state is:
1. When first opening IE: Right-click on the IE icon on the QuickLaunch toolbar (NOT the IE icon on the Desktop), choose Properties, click the Shortcut tab. In the 'Run' field, click the dropdown arrow and choose 'Maximised' from the menu. Then Click Apply and OK to exit. To view the QuickLaunch toolbar, right-click on the Taskbar and go to Toolbars > QuickLaunch.
2. To open windows maximised when clicking on a link: First open a page with a link on it, this forum for example.
Click on the link to open the window (usually it will open smaller than maximised).
Using your mouse cursor, drag the sides of that window until the window fills the screen. Then Minimise (not close) that window you have just dragged larger.
When it is minimised you will see the original window underneath (the one containing the link you clicked earlier). Close that original window using the little 'x' in the top right-hand corner of the window.
Now restore the minimised window from the taskbar (that's the one you dragged larger) and close it also, using the little 'x' in the top right-hand corner of the window.
Now all your windows should open to full screen (or to the size you dragged the window to earlier).