Many Linux distribution allow dual boot with Windows. I want to try alternate Linux os with windows. However, I am not aware how to remove it after giving a try.
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If you want to test another Linux distribution I would simply start the installation, format the partition of your previous Linux installation and select it as storage for the new one.
If you want to go all the way back to windows only you will have to start/boot from the Windows CD
with Windows 7:
chose to repair Windows
start a command prompt and issue the following commands
with Windows XP:
chose to start the recovery console
select your Windows installation
at the command line issue the following commands
After restarting the computer you should automatically get into Windows.
Rightclick the "My Computer" icon and select Manage (or manually navigate to the Administrative Tools within the Control Panel)
navigate to Storage > Disk Management
Format the Linux partition