How do I restore or re-install Windows on my aspire one D255E netbook if I don't have a disk drive?

You need to replace your harddrive, follow this guide:
https://www.youtube.com/watch?v=gRl622WgaWI

After that you need to find an Windows CD to install from.

You have several options, like contacting ACER for a restore disc and make a USB installation with: http://www.microsoftstore.com/store/msus/html/pbPage.Help_Win7_usbdvd_dwnTool/
Of course you will have to use another PC to make it. You can also use a regular Windows installation disc, but you may need to locate the drivers on your own.

Download Windows Boot Genius in your computer , and run it to burn a usb flash drive into a recovery disk, then you can restore your computer easily.

Switch ON the PC, boot the PC in 'Safe Mode' by continuously tapping F8 button after you switch On until you get the Safe Mode Option.

Let windows boot in Safe Mode and log in to windows.

Go to 'Start'--->Programs--->Accessories--->System Tools--->Click 'System Restore'

A 'System Restore' window will appear.

Here you will have to check "Restore computer to an earlier time' and click Next

Now you will find one Month Calendar window with Dates below, go to the previous month by clicking the '<' sign in the upper left hand corner of the Month Calendar and select any date that you see in Bold.

Note: It is better if you could remember from which date you are facing the issue, try to select a date prior to that date.

The detail of that particular date should show "System Checkpoint" and time on the right hand side box. Select that date.

Now, Click on Next and System Restore will start and windows will take a reboot.

After reboot your problem should be resolved.

Install the Restoration Disk into the optical drive, (DVD drive), and when asked perform a Full Installation. (Destructive Installation)

Or install a fresh new genuine copy of Windows, and perform a Full Installation.

(You may need to go into BIOS Setup, and in Boot Options, set the first boot device to CDROM)

Don't have the Restoration Disk? (Or if you are the first owner did you make one?)
Try contacting Acer Support.

(From reading experiences with others, it would seem you would be better off just buying a new-genuine copy of Windows. Easier to obtain )

Remember, formatting in this mode will remove ALL personal data from the netbook.
No personal documents you have created, or downloaded, no programs you have installed or downloaded, no photos, music, videos, nada, will be saved.
The netbook will go back to the way it was Day 1 from the factory.

Regards,
joecoolvette

It sure sounds like a problem with the hard drive. Acers usually don't include diagnostic tools to check it out, but that is what I would do next. If you don't know how to proceed, use a hard drive diagnostic like DFT to diagnose the hard drive.
visit http://www.hitachigst.com/support/downloads/
to get the info and download the DFT program. This will work on non-Hitachi drives as well, so don't worry about what type of drive is in your Acer.
If the drive is bad, it is a fairly simple matter of installing a new hard drive and reinstalling windows onto it. It's hard to say if the data on that drive is recoverable or not.

Switch ON the PC, boot the PC in 'Safe Mode' by continuously tapping F8 button after you switch On until you get the Safe Mode Option.

Let windows boot in Safe Mode and log in to windows.

1. Open the Start Menu.

A) Click on All Programs, Accessories, System Tools, and System Restore.

2. Open the Control Panel (All Items View).

A) Click on the Recovery icon.
B) Click on the Open System Restore button.

A 'System Restore' window will appear. Here you will have to check "Restore computer to an earlier time'

A) Click on the Next button

Now you will find a window with Dates, Description and Type,

Note: It is better if you could remember from which date you are facing the issue, try to select a date prior to that date.

The detail of that particular date should show "System Checkpoint" and time on the right hand side box. Select that date.

Now, Click on Next and System Restore will start. Click on the Finish button and windows will take a reboot.

You could use Windows System Recovery to place you're computer on a previous state and you don't gonna need another copy of windows 7

Good Day Albert!

After reformat and installation of Windows, you will need the drivers for your audio.

Download audio driver here, go to:
http://www.netbookfiles.com/12880/acer-aspire-one-d255e-audio-driver-win7-32bit-6016246/

and

To look for other drivers that you will need for your Aspire One, go to:
http://www.netbookfiles.com/netbook/Acer/Aspire-One-D255E/1