i installed ubuntu 12.10 along with windows but now i want to permanently remove it from my computer as it is quite uncomfortable to evrytime choose the OS for boot during startup pls help
Get rid of Ubuntu:
Boot your windows boot disc and fix the master boot record to get rid of Ubuntus Grub menu. The process is described here:
If you rebooted to Windows and didn't encounter the Grub menu, you're free to do with Ubuntus partitions whatever you please (if you don't have any valuable data on its partitions).
A (IMHO) better alternative:
Keep Ubuntu, but make the default entry for the Grub boot loader Windows. Now you can still boot Ubuntu if you like, but if you don't select its entry in the boot menu, Windows gets loaded.
See this answer: How do I set Windows to boot as the default in the boot loader?