|The specific model of the laptop or netbook is probably on a label on the bottom of the case. Tell us what that is. |
The first blue screen indicates the bios was not finding a bootable device, not necessarily that the hard drive was unplugged. It wouldn't be unplugged on a laptop or netbook unless you or your sister unplugged it, or someone has stolen the hard drive. (Your second blue screen message is something you would not see unless a drive with 2000 or XP installed on it was being detected by the bios. )
Is it possible the laptop was dropped or had liquid spilled on since it last worked properly ?
OR - someone changed the Boot Order or similar settings in the bios Setup, and it's trying to boot from a network adapter rather than the hard drive, and in that case it won't find a bootable device.
Make sure the Boot Order or similar settings are correct.
See Response 1:
If they are correct, the bios is probably not finding that the hard drive is bootable, at least some of the time, when you boot.
However - make sure no USB flash drives or USB external hard drives or other USB connected devices data can be stored are connected to the laptop when you boot. Some bioses in certain circumstances will try to boot from a USB device - in most cases the device is not bootable, and if it isn't, often the bios will not try to boot from anything else, you will get that message.
The second blue screen - the last letter in the Stop error is either B or D.
The first thing you try when you get a message that says "If this is the first time...."
is you try booting the computer again, at least several times. Sometimes Windows will work, or sometimes will work, when you do that. Sometimes Windows will eventually fix the problem, Windows will load, and you will a message"Windows has recovered from a serious error" or similar.
If you can't do anything when or after you get the message, hold the power button down for at least 4 seconds until the computer shuts off, then let go and try pressing the power button again.
Make sure no USB flash drives or USB external hard drives or other USB connected devices data can be stored are connected to the laptop when you boot.
STOP: 0X0000007D = INSTALL_MORE_MEMORY
"This stop error code indicates that there is not enough memory to start up the Microsoft Windows operating system."
It's not likely to be that unless you removed some ram, or at least one ram module has a poor connection because the laptop was dropped or had liquid spilled on it.
STOP: 0X0000007B = INACCESSIBLE_BOOT_DEVICE
That has many possible causes.
The first thing you should do is test the hard drive.
If you don't have a floppy drive, you can get a CD image diagnostic utility from most hard drive manufacturer's web sites, but obviously you would need to make a burned CD, preferably a CD-R for best compatibility, on another computer if you need to.
However, if the hard drive was made by Toshiba, they do not provide diagnostics.
Seagate's Seatools will test any brand of hard drive.
Do the long test.
If the hard drive itself tests okay, any data problems found can be fixed, one way or another.
If the hard drive itself tests okay, you can copy data off the drive even if Windows will not work normally. E.g. you can get a download that you can make a bootable Linux CD with on another computer, then boot the laptop with that.
If the hard drive itself tests okay, if you have an XP re-installation CD that came with the computer, or an OEM regular Microsoft CD that has "For distribution with a new PC only. " printed on it, of the SAME version - Home or PRO - that's on the computer, then you can use that CD along with the oem Product Key that's on the official Microsoft label on the computer case.
NOTE that an XP re-installation CD for a different brand name computer model will probably refuse to load Windows !
However you probably DO NOT need to install Windows from scratch - that's a last resort.
You can try booting from the CD and running chkdsk /r and other commands in the Recovery Console
If that doesn't help , you can try running a Repair installtion of XP which will NOT delete the personal data on the Windows partition
If that doesn't help, THEN you could install Windows from scratch.
If your computer has a SATA hard drive, the initial files loaded from the XP CD may NOT find any SATA drives by default ! More info about that, and how to get around that -
see response 1 in this:
Also there - more info about a Repair installation procedure