i want to format c drive in which windows vista is installed and i want to intall windows xp. i have created a windows XP bootable pendrive from which i can run the setup of windows XP. i changed the boot options to boot from pendrive and the boot process starts. i select the option of installing windows XP. then i get option to choose the partition on which XP has to be installed. the problem comes here - the option shows only the drive letter of pendrive. there is no c drive option available. the list shows - U: Partition <USB_XO_710> [FAT] 1956MB (1220MB FREE) there is option to install xp , delete partition or make partiton plz tell me how to remove windows vista and install winXP in c drive?