My problem is I have ubuntu 11.04 installed on my system. I have no other os installed. I have tried to install windows xp using bootable cd of XP. But it doesn't work. Blank screen appears. How can I remove ubuntu then? I have tried many ways using gparted and all but no result.
3 possible methods for removing an operating system from your hard disc (so it does not even have to be Ubuntu):
If you decide to stick to gParted then this link explains how to do that. Copy/paste from that link:
Do not forget to read the "caution" part underneath these pointers.