Video on laptop decreases in size

When I closed the lid on my Dell Inspiron 8000 and it
went into suspend mode, my secondary hard drive, which
was running and has windows XP on it, the video goes to
about 1/3 the size, this has happened before and I have
had to restore the computer but now I cannot restore and
I need to know if there is a way to get back to the
correct video. I have changed to 1600x1200 and itgoes to
full screen but when I change it to lower resolution the
screen just gets smaller. Any help would be greatly
appreciated.