how do i fix my computer and start it up when it has a blue screen with:unamountable boot volume on it?
101162
It sounds like either your harddrive crashed or has been disconnected.  Check to make sure the harddrive is connected properly.  Beyond that you'll have to replace the harddrive and re-install your operating system.
590860
try to boot ur comp in safe mode by pressing F8 during booting and open.\n\nif u don have any thing important in it just format it by a right click and format option. if it donesn work put some os installation cd and format it.
989510
Just restart your computer and hit F8 repeatedly until you get a windows menu.  That menu should give you an option to boot up in safe mode.
707314
just reformat everything.  the windows o/s you have should boot automatically from your CD-ROM.  there are free utilities from majorgeeks.com to retrieve your lost data, even if you've reformatted the drive(s).  good luck, you're NOT an idiot.  everyone has had their computer woes.  how'd your Vista go?
191924
If you get the message "Non system disk" upon bootup and you can't get rid of it, it looks like your hard drive crashed.  If the boot sector on the hard drive is toast, it can't boot up and you'll get that message.\n\nAs for fixing it... I honestly hope you didn't have anything important on it.\n\nLets see... Double-check there's no disks in any drives, including CD-ROMs.  Try going into your BIOS setup and resetting it to the defaults. If none of this works, you may have to take more drastic measures.\n\nIf you have another PC, you can take the hard drive out and put it in as a slave in the second PC. This will at least allow you to copy off anything you need.\n\nIf you don't have another PC, you can try re-installing windows over itself. Just make sure you don't re-format or re-partition in the process.  As long as you keep the current file system, you won't lose any data.
437077
Corrupt boot file, if you are running XP then try using repair on it by booting from CD.
226895
try to reinstall windows .. or format the hard disk and install a fresh copy
10184
do a windows xp INPLACE UPGRADE..\n\nAKA windows xp repair.  boot from cd.. (DONT GOTO THE RECOVERY CONCSOLE) when the list of windows comes up choose the option to repair it.
756194
It may be as simple as removing a floppy disk, or it may be a CMOS config problem that is not pointing to the right boot device. If you have tried both of these then (yikes) it may be that your hard drive is crashed. If this is the case you may be able to get it back by booting from a bootable system floppy disk or a windows CD and then running scandisk on the hard drive.
763756
repair or reinstall windows...
907587
you can just reformat it. put in your operating system cd and restart your computer. the setup program should start and then ask you if you want to repair the os or reformat it. reformat it. if you're not sure, take it to a computer repair shop and i'm sure they can help you.
144253
Hit f8 continually in startup. If you get an option to restore system to previous time accept it. starting up in safe mode should work.
407627
Boot in dos type CHKDSK or SCANDISK there might be bad sectors on your hard disk.
198061
Boot the computer up in safe mode by pressing F8 a couple of times before the windows loading screen appears and select safe mode. If the computer boots you have a problem with one of the driver files if the computer does not boot their is a corrupt main driver file. If you get it running run a scan disk for when the computer is next turned on this should fix any file system errors. See how you get on.If your computer does not boot you might have to reinstall windows making sure you reformat the hard drive (worst case)You might also have a program trying to run when you turn on your computer which has an error causing your computer to screw up.
169464
This Boot Failure Troubleshooting Flowchart should get you started (PDF file):\n\nhttp://www.fonerbooks.com/poster.pdf
213460
Leave the password blank (just hit "enter") and run a repair installation.\n\n\nUPDATED RESPONSE:\n\nIf fixboot/fixmbr worked, then simply reboot. If it still doesn't boot...go back and do the same thing, except do a "repair installation" instead of running fixboot/fixmbr.\n\nHere are the instructions (with screenshots) on how to do that.\n\nhttp://www.webtree.ca/windowsxp/repair_xp.htm#How%20to%20Repair%20Windows%20XP%20by%20Installing%20Over%20top%20of%20Existing%20Setup:
410239
you might wanna try to go into your bios and see if the boot from hard drive is still enabled. you might have it booting up from your cd rom drive or something