I turn on, it comes up with windows failed to start,and says start-up repair required.

This error message means that the copy of Windows installed in your computer is either corrupted or damage and reinstalling or repairing your Windows should fix the problem.

But try doing System Restore first on safe mode before doing a Windows reinstallation or repair to save you from loosing all you files in your computer.

To do system restore on safe mode:
1. Restart your computer and when the Dell Logo comes up and keep pressing F8 until an option shows
2. Use arrows to navigate then choose safe mode
3. Click start button then choose All programs or Program depending on the Windows installed in your computer
4. Click on System tools then choose System Restore
5. Follow the intructions on the System Restore windows on how to restore your machine back to a previous date before this issue happen.
6. Your computer will automatically restart after restore is done

If the safe mode doesnt work then your last option is to reinstall or repair your windows

1. Press F1 to go to BIOS then change boot priority - make sure your DVD drive is the first boot
2. When your done changing boot sequence press F10 to save and exit
3. Insert you Windows CD and and a meesage will appear on a black scrren "Press and key to continue" press any key. Windows file will load and options for Repair or Installation will appear
4. Choose 1 of the option then follow instruction


Hope this information will be helpful. Thank you for using FIXYA.