please help me uninstall ubuntu!

There is no step by step. You just boot the windows CD and install overwriting Ubuntu.

Regarding Ubuntu, it is something special. I use it on every computer in my life. I have had some issues with less than compatible hardware but that is not Ubuntu's fault. You may have poorly supported hardware too. Switching takes some effort and without well supported hardware even more. However, it can be done. I dual booted for about 18 months before blowing windows away. Happiest day of my computing life. I'll never go back.

+1 jim ubuntu is easier than windows to use.. If you are badly in need then:

Note: The following instructions were developed for Windows XP Home Edition.
Other Windows OSs may vary somewhat.

To remove Ubuntu and restore your Windows OS to its original state
System Restore will not work. You must complete three separate
procedures in the following order:

   1. Restore your Master Boot Record (MBR)
   2. Delete the partition
   3. Resize your Windows partition back to its original size

To complete the following instructions you will require two CDs:

* Windows Setup CD
* GParted Live CD. This is the partition management tool I used to
      create these instructions. There are other partition management
      tools available that should also work, but of course the
      instructions will be somewhat different. Instructions for burning
      a copy of the GParted Live CD may be found on the Internet at
      ftp://download.tuxfamily.org/gpartedlive/

and burn the ISO using nero on windows,

More info:

http://asp2.wlv.ac.uk/its/website/selfhelp/help/nero/help_with_nero.asp
(or)
If you are using ubuntu 7.04 or ubuntu 7.10 live CD no need of gparted live CD..

To restore your MBR:

   1. Insert the Windows Setup CD into the CD or DVD tray on your computer.
   2. Restart your computer.
   3. Hit Enter to reboot from the Windows CD when prompted to do so.
   4. Type “R” and hit Enter in Windows Setup to enter the Recovery
      Console. The Recovery Console will appear and list the Windows OSs
      on your machine.
   5. Select the number corresponding to the Windows installation you
      wish to boot into. For most people this will be a “1”. (In some
      versions of the Recovery Console the installations will be
      numbered. In others, you will have to deduce the installation
      number from the order of priority in the list.)
   6. Windows will prompt you for an Administrator password. Try your
      Administrator password or, if your Administrator password does not
      work, hit Enter.
   7. At the Windows prompt, type “fixmbr”.
   8. Type “exit” to restart the computer.

Your computer should restart using the Windows installation you selected.

To delete the Ubuntu partition:

There are several ways you can delete a partition, including Computer
Management (Local) and Command Prompt from within Windows itself (for
more information type “delete partition” in Help and Support in the
Start menu). However, since you will be using the GParted LiveCD anyway,
the following instructions will instruct you in the correct procedure
using the GParted LiveCD. You can go straight from deleting the Ubuntu
partition to resizing the Windows partition. If you have not already
burned a copy of the GParted LiveCD, do so now before continuing below.

   9. Insert the GParted LiveCD in the CD or DVD tray on your PC.
  10. To accept the default boot options hit Enter.
  11. To accept US English language hit Enter.
  12. To accept the default keymap hit Enter.
  13. To accept the default screen depth hit Enter.
  14. Click on the Ubuntu partition in the graphical display.
  15. Press the Delete button.
(or if you are using ubuntu live cd ..)
Pop in the live cd and go system -> administration -> install and repeat steps 14 and 15

To resize the Windows partition:

  16. Click on the Windows partition.
  17. Press the Resize button.
  18. Resize your partition by dragging the left and right borders of
      the graphic representation of the partition to the desired size
      (typically, to the maximum extent possible).
  19. Press the Resize button.
  20. Press the Shutdown button (red arrows in extreme lower right
      corner of the display).
  21. To eject the CD and restart, hit Enter.
  22. The GParted/ubuntu Live CD will eject. Remove the CD from the tray. It is
      not necessary to close the tray manually.
  23. Hit Enter.

Your computer should restart using the Windows installation you selected.

To verify that your Windows partition has been resized, navigate to
Start / All Programs / Accessories / System Tools / Disk Defragmenter.
The Capacity is indicated in the fourth column.

Hope that helps,

Bhavani Shankar.

i guess i didn't explain it carfully enough.............i have NO windows os ......... when i installed ubuntu i let it take over the entire disk...i have used ms dos & gparted to delete partitions and reformat the hdd to (first) htfs format.....didn't work.....(2nd) fat 16 format..still didn't work......then i tried fat 32..........didn't work.........
i have the factory windows vista restore disks.........i try loading them....1st one loads ok, 2nd one loads only for about 10 seconds, says it's comlete, but it isn't really..........then it says to restart.........when the computer reboots....it comes up black screen.....says grub is loading, ERROR message, screen freezes!!!!
i need help.........not to be talked into keeping linux.........i will try that latter on another computer........i need to get linus/ubunto completely wipped from this one........i need it to work....hate to say it on this forum but vista works for me! can you please help???

Thanks Tony Mugan, that solved my question.

i finally got the grub out & then windows installed ok.......i really like ubuntu & plan to try it again on another computer but i needed this notebook wroking using all the hardware....something i couldn't do using ubuntu.

I installed Ubuntu under Dos and want to uninstall it. Than to install it under Vista.

the way i got rid of ubuntu & got windows back was to use the gParted tool..........i completly deleted all the partitions on my hard disk (i only have one) & formated it to FAT16.....that got rid of the ubuntu grub (only way i knew to do it, i tried every other way i could think of including the advice i got from this forum)
THEN.....i reinstalled windows vista.
i know vista, or windows in general isn't the greatest os...but it works for me, it has all the drivers to make my hardware work! i hated having to set up all the stuff ubuntu forces you to do & half the things still wouldn't work...i couldn't even get a ppp (phone line connection) to work.....using vista, my ppp, ethernet, and wireless work without me having to do a thing......
i plan to try a linux os on another computer someday....but not on my main computer....i need it to WORK!

hope this is helpfull to everyone....i'm not trying to offend any linux users!

firat i downloaded the gParted tool and burned it to a cd...........then i booted from that disk.....