How do i reset my emachine t5048 to factory setting without the windows boot disc?

1. Boot the computer to the boot menu: To do this, restart the computer and press the appropriate key when prompted to enter the boot menu. On most eMachines computers, this is the "F12" key.
2. Select the CD/DVD drive as the boot device: Use the arrow keys to select the CD/DVD drive and press the "Enter" key to boot from it.
3. Insert the Windows ME boot disk: Insert the boot disk into the CD/DVD drive and restart the computer.
4. Choose the "Start Computer with CD-ROM support" option: When prompted, choose the "Start Computer with CD-ROM support" option.
5. Run the Windows ME setup program: The setup program should start automatically. Follow the on-screen instructions to install Windows ME.
6. Format the hard drive: During the setup process, you will be prompted to format the hard drive. Choose the "Full" format option to erase all existing data and perform a complete factory reset.
7. Install Windows ME: Continue to follow the on-screen instructions to complete the installation of Windows ME.

After the installation is complete, the computer should be in a factory reset state and you can begin setting it up as a new system.
Please note that resetting your computer to the factory settings will erase all personal data and installed programs, so be sure to back up any important data before proceeding with the reset.

F9 or F12 leads you too a system recovery to reformat the pc or you can download hirens boot cd off google that fixes NTLRD errors

There are two variants of the T5048 One uses DDR PC3200 ram the other uses DDR2 PC5300
Should be able to look at the old ram and it should say on it what it is. If it doesn't, take out the new, put in the old ram and go here http://www.crucial.com/store/drammemory.aspx Run the "Scan My Computer"
Some computers will have a setting in BIOS to disable on board video although eMachine are very low end and probably don't offer that. Shouldn't need to just install your video card and plug your monitor into it. It should work just fine without disabling on board.

Comment if you need more help

You'll need a copy of Windows. Microsoft has guides on how to install and uninstall all windows versions here: http://windows.microsoft.com/en-US/windows/help/install-reinstall-uninstall

Did this come with a recovery disc and you lost it? If it didn't come with one you may have a recovery partition that you can boot to. If there IS a recovery partition you should see a message on bootup that will tell you what button to push to startup to the recovery partition. If you DON'T have a recovery partition your only options are a clean install with a Windows installation disc or to call emachines (gateway) to see if they have a disc to send you.

You can contact them by following the instructions here:

http://secure3.tx.acer.com/findsystem/FindSystem.aspx?title=Contact+Support&brand=eMachines

You could try to use Windows Password Buster. This software can help you recover your password.

Here's the tutorial: http://www.password-buster.com/reset-windows-local-password.html

The only way to restore back to factory settings without the CD is by booting into your Recovery Partition, IF YOU HAVE A RECOVERY PARTITION. If you do have a recovery partition, then you should see an option for booting from that when you first start up your computer. It should be listed with Setup and Boot Menu options. Press the key that is displayed for entering recovery. From there you can choose what type of recovery you are wanting to do. If you know that you have a recovery partition, but don't see it listed when your computer first starts up, then start tapping F8 when you first boot your computer. You should see a black screen with white text. From there you can choose Safe Mode or whatever. You should see something labeled Recovery or Utilities in that area if you really have a Recovery partition. If you don't see this, then you will have to go to emachine.com and request a recovery disc from them. They will likely ask you alot of questions in order to get the disc. Usually it costs between $20 - $50 for the recovery disc. The only other option you have is to go to Staples or some other store and buy the Operating System you want.

You should just wipe your hard drive clean, then..........

Install Fresh CLEANl Windows (Genuine Microsoft Disc).......Not the Software you got with the emachine......

You can borrow a Windows Disc of the same windows Version and use the License you got..... :)

then update the drivers.......

Never use anything but a REAL windows installation........without any other software (trial, adware, etc......) ALL OF PREMANUFACTURED PCs COME LOADED WITH ****.

it probably says insert suitable boot device. If you are trying to boot from a cd go into the bios and set the boot device priority to CD as priority. If hard drive then set hard disk to the top.

Can you still log in to Windows Vista?
e machine has a RECOVERY MANAGEMENT allows you to restore sytem to factory default or reboot and tap F10 and follow instructions.

Good Luck!