How to uninstall ubuntu from windows 7?

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http://askubuntu.com – I have nothing against ubuntu. Completely satisfied with its performance. But after some while now, i dont have much of hard disk space for my own files. So i consider having windows 7 and uninstalling ubuntu. currently i get dual booting option when i turn on my PC. i got to know that uninstalling ubuntu would result in some repair work to be done for windows 7. please detail me on this. also brief me how to uninstall ubuntu, bcoz i get an uninstall file in windows 7 in the location where i have installed ubuntu.how should i proceed on this?? please help me out.. thank you (HowTos)