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I had 12.04 installed but want to go back to Windows 7. After formatting my drive I am presented with the message System not found even when booting from a CD. I could not even reinstall Ubuntu with this error.

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marked as duplicate by Takkat, guntbert, Seth, psusi, karel Oct 20 '13 at 2:20

This question was marked as an exact duplicate of an existing question.

Bitte schreiben Sie ihre Frage auf Englisch. Please write your question in English. – chaos Oct 19 '13 at 18:48
You may have to change the boot order in BIOS. – Takkat Oct 19 '13 at 18:56
mache ich ja jedesmal – Felix Benkert Oct 19 '13 at 19:32
Why Win7 now Win 8 is out! Why install an old OS? – Ice Oct 19 '13 at 20:21
daher ich nur win 7 habe und win 8 um die 100 euro kostet – Felix Benkert Oct 20 '13 at 14:10

It is not customary or necessary to remove one operating sytem in order to make space for another. If you want to get rid of Ubuntu, you can just leave it on the disk and remove or overwrite the partion from the Windows installation medium. The Windows installer will offer to overwrite anything, that it cannot handle more gracefully.

The same works vice versa, with the addition that Ubuntu also offers a nondestructive installation inside a Windows partition. Microsofts operating system is not that advanced, although the company would be free to make use of the necessary file system code from Linux.

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I think its easy, just download windows 7.iso and use archiver to open it, than copy all the files to clear USB drive. Restart your PC and when your PC turns off you must get that USB to PC and bios automaticly starts booting from USB (sorry form my english but I am from Slovakia and I am jus 13 years ols :)

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Why do you suggest to use a USB-Drive? If he doesn't have a CD-Drive to boot from, from where will he boot? What archiver should he use? Are you suggesting to get a pirated windows7.iso? That's why I gave you a down-vote. – MadMike Oct 29 '13 at 12:25

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