My computer won't turn on properly. It keeps saying disk error press control alt delete. When I do it just says it again and again. It won't load and turn on.

First you should check if there is any disk on your cd room, if there is any disk you should remove the disk from the cd room, if there is no disk the possibility is your hard drive getting error
Press f2 or delete to enter your bios set up system
Look for boot menu
Set the first boot as a HDD and the second boot as cd room and disable the third boot
Save and Exit the setting
if your computer still won't load you need to reinstall your windows
insert windows cd and go to set up again by pressing f2 or delete button
Set the first boot as cd room then the second boot as HDD
Save and exit the setting again
When the message press any key to boot from cd appears you should press the space bar or another key
Then just follow the instruction of formatting