Hi Dub,
Start Right-click My Computer and click Properties. Click on Advanced
Click Settings under Startup and Recovery. Look under Default operating
system:
Now you said it happened before. How many Hard Drives are installed and
their sizes? Are the Hard Drive(s) partitioned? If you have two bootable
Hard Drives in the computer, in the Computer can you select which the
computer boots to first?
The Computer Bios Boot Order may have changed, which is why you are
having problems. What brand of Bios is installed? Can you access Computer
BIOS? The Key to press is usually listed on the opening screen. Look in each
Menu, until you find it. The Menus to go into are usually in the Left side
of the screen.