I bought both windows XP and Windows 7.I copied all the files from windows 7 dvd to my pc and made an ISO knowing that i usually lose DVDs.I lost the windows 7 DVD exactly as i thought.I internally installed it .I have 2 partitions. C and E.I have XP on C and 7 on E.How can i uninstall XP?I tried formatting but it said that windows is unable to complete the format.Can anyone help me?