[FlawedChip]

Here are a two suggestions:

Try make the Internet Explorer window the size you want it, and then exit the program using File > Close. Do not exit by clicking the large 'X.' I am not certain if this will work if you click the maximize window button, but you should be able to stretch the size of the to how you like it.

An alternative method is to press and hold the shift key while exiting Internet Explorer by clicking on the 'X.' I believe this is known as a "hard close" and will force Internet Explorer to remember its last position and size.

I used to have this problem all the time, and it can be very frustrating. I hope this helps.