Password reset acer aspire one d250 wont boot

SOURCE: I'm running a Windows 7 netbook- acer aspire

This message means that the computer cannot see the hard drive. Unofrtunately, this is usually caused by a failed Hard Disk drive. However, you could try removing and re-fitting the hard drive to see if this cures the problem.

Full instructions on removing and replacing the hard drive can be found here:

http://www.laptopmag.com/advice/how-to/aspire-one-hdd.aspx

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SOURCE: For Atheros PCIE Ethernet Controller... check

You didn't list your PC model or make, but it appears that you have enabled the network card to boot from it's rom chip. Turn that option off in your software or pcie Bios control.

SOURCE: For Atheros PCIE Ethernet Controller...

system is trying to boot to a network, this is most likely due to the hard disk drive not being detected, or the windows operating system is missing.
First reset the BIOS defaults, see if the system detects the HDD in the bios and will now boot.

Run diagnostics on the hard disk drive, which I suspect it will fail.
If diags on the drive pass, they try reinstalling Windows. But I expect you'll be replacing the drive.

SOURCE: Upon startup before anything else

This means you should install an Operating System.
If your notebook doesn't have a dvd drive you can install the Operating System with an external drive (dvd, USB flash drive or hard drive). and press F12 when it starts to select the booting device.
Follow the link below to find out how to create a USB flash drive bootable (also works on hard drives):
http://forum.bstdownload.com/how/55-how-create-bootable-usb-stick-when-using-windows-vista-windows-7-a.html

SOURCE: When I turn on my

The PXE ROM is part of your system's network interface controller. It is being entered on your system's startup to look for a bootable image on a physical network connection and if found, to boot from that image. If there is no network cable connection to your system or if there is but no bootable device is found on that connection, the result is the error message that you got. As to why your system is entering the PXE ROM can be explained by looking at your system's Setup Utility,,,

Press F2 while powering up to enter the Setup Utility and use the cursor control keys to go to the Boot tab which then shows the Boot priority order. The default order is as follows...
1. IDE0
2. IDE1
3. USB FDD
4. USB HDD
5. Network Boot : LEGACY PCI DEVICE
6. USB CDROM
Your system's internal hard disk drive should be listed beside IDE0 and it will be accessed first to look for a boot record. If the drive fails to boot, the next devices in the list will be accessed accordingly until either a bootable device is found or the last item which is USB CDROM. If a USB CDROM is plugged in on one of the system's USB ports, it will be checked for a bootable record and if not found or no CDROM is plugged in, then the system displays the last part of the message -- insert boot disk and press any key.

Press F12 while powering up enters the Boot Menu which has the Boot Option Menu. This menu should show by default the following...
1. IDE 0: (the name/type information for your system's internal hard disk drive
2. Network Boot: LEGACY PCI DEVICE

If there is no hard disk drive information shown beside IDE 0, then the possibilities are that
1. there is no internal hard drive present
2. there is a hard drive but it has failed
If there is hard disk drive information and pressing enter to select it does not result in an operating system startup, then the drive's startup partition has been wiped and so it has no bootable image.

If there seems to be an internal hard drive present but it has no bootable image, you may attempt recovery from the installation images in the hidden partition. The recovery allows restoration of...
1. operating system to factory defaults
2. applications (selectable)
3. drivers (selectable)

Press Alt and F10 keys together while powering up and the Acer logo is showing to enter Acer's eRecovery Management. Follow the instructions to do the recovery which will erase all user data and restore the operating system to its factory default when you purchased the netbook.