Windows Xp and Windows 7 Dual Boot remove XP

Ok i have windows 7 and windows xp in a dual boot and i used xp sometimes but now i rarely use xp and i am thinking of erasing xp.But as xp is installed on the drive where the windows 7 boot files are located i cant format it. Startup Repair - Run 3 Separate Times
i found that article but i couldn't find mark as active for the windows 7 drive. So is there a way to get rid of windows xp? and yeah i am Planning to install ubuntu on the drive where xp is now installed.

Two drives or two partitions?

Startup Repair
Note: You may need to do startup repair 3 to 4 times.
Startup Repair - Run 3 Separate Times

Partition - Mark as Active

Dual Boot Windows 7 and Ubuntu

theog said:

Two drives or two partitions?

Startup Repair
Note: You may need to do startup repair 3 to 4 times.
Startup Repair - Run 3 Separate Times

Partition - Mark as Active

Dual Boot Windows 7 and Ubuntu

Two Partitions. and the thing is that my comp doen't have a DVD drive while my windows 7 installation is a DVD.i Had to boot in to Xp and then run the setup files which was copied to my Pen drive.(for some reason the i am not even able to boot from the USB)so i cant go go into the recovery mode

You need the Windows 7 DVD files on Pen Drive, or the Startup disk files.

USB Windows 7 Installation Key Drive - Create
System Repair Disc - Create

can i format the xp partition with the xp setup cd? will windows 7 boot?

You said, you had NO CD/DVD drive.

theog said:

You said, you had NO CD/DVD drive.

i said i didn't have a DVD drive not CD/DVD drive. my drive can read cd not DVD

Make a Win7 System Repair Disc - Create

Boot it to mark Win7 Active using theog's link posted earlier, then run Startup Repair up to 3 separate times with reboots to write the System Boot Files to Win7. You can then delete XP in Win7 Disk Mgmt.

If you want to recover the XP HD space into Win7 then use free Partition Wizard bootable CD to delete XP, rightclick>Resize Win7, slide left grey border to the left to take up the delete space, OK, Apply.

If you have any further problems, please post back a screenshot of your full Disk Mgmt drive map, using Snipping Tool in Start Menu.

Thanks for helping but i got it working. what i did was boot from the repair disk(created with my laptop) and format the xp partition with diskpart. then i ran the startup repair two times and i am good as new.