Hi,
" A: Drive Error" this is your 3 1/2 floppy that you probably do not have. you need to open your BIOS and disable the floppy, you will have to look for it on the first or second listing (Normally).
"How to Change Computer BIOS Settings
From time to time, we must make modifications to our computers that require going into the BIOS of the machine. Although each computer is different, most use standard ways of getting in, changing values, and saving the configuration.
[edit]Steps
When your PC is starting up, press the Setup key. This is usually Del, F2, or F12. The key, however, differs with each machine. It should be stated on the screen which key is the setup key.
Once you enter the computer's BIOS, use the arrow keys and tab key to move between elements. Press enter to select an item to change.
Find the 'Save and Exit' item once you have applied the settings. If you cannot find it, try pressing ESC and seeing if it prompts you to save." (copied from
http://www.wikihow.com/Change-Computer-BIOS-Settings as you can not access the net)