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#11
This guide assumes that you already have windows installed. Samiksha, make sure you restore your windows before following this guide.
I'd recommend choosing option 2 for installation from this guide. One change I'd recommend for a novice user with this is to choose "install alongside other operating systems" during step 8 listed in the instructions that theog linked you to. It is just a bit more user friendly to resize the partitions this way. Great tutorial though, if you follow the steps provided you should have no trouble getting both Windows and Ubuntu installed properly.
Good luck :)