Reinstall Ubuntu

[Georgescu1]

I have windows 7 and ubuntu
I want to completely remove ubuntu and then reinstall it again
The first time i installed ubuntu was from windows itself and well some problems occur now I have the CD to install from it

so, how exactly it's a complete clean reinstall without affecting my Windows partitions?

is this a good removal:
http://www.youtube.com/watch?v=uUgf84bdYvg

[oldfred]

If you have wubi or Ubuntu inside Windows, it is different.

Post this to be sure:

sudo fdisk -lu

Also make a Windows repairCD and backup everything that is important.

Backups ---------
The vendor recovery DVDs are just an image of your drive as purchased. If you have housecleaned a lot of cruft normally included, run many updates with many reboots, and added software you may want a full back up.
Backup windows before install - post by Mark Phelps
http://ubuntuforums.org/showthread.php?t=1626990
http://www.macrium.com/reflectfree.asp
Another suggestion by srs5694
http://www.runtime.org/driveimage-xml.htm

Make your own Windows repairCD (not vendor recovery):
http://windows.microsoft.com/en-GB/w...em-repair-disc
http://forums.techarena.in/guides-tutorials/1114725.htm

Windows 7 repair USB, Also Vista if service pack installed
http://www.intowindows.com/how-to-re...tion-dvd-disc/
http://www.webupd8.org/2010/10/creat...usb-drive.html