"Windows could not complete the installation. To install Windows on theis compuiter, restart the installation."

When prompted with error unable to complete installation:

Hit SHIFT-F10 to bring up command prompt.

type MMC

Click File -> Add/Remove Snap-in... (Or CTRL+M)

Select Computer Management (Double click and Finish on Local Computer)

Click OK

Double click Computer Management (Local) -> System Tools -> Local Users and Groups -> Users -> Double Click Administrator -> Uncheck Account is disabled -> OK

Now right click Administrator -> Set Password...  ->  Set a decent password to get started.

Now, restart.  Should be good to go.

If this doesn't work try next step:

SHIFT-F10 to bring up command prompt.

type:  CD C:\windows\system32\oobe

type msoobe

enter

Make a generic account and password.  hit finish (if it requests a product key and you have one, enter it now.  if OEM/No key required, just finish).  Set time/date.  Finish.

Restart.

Should be good to go.