Here we have very efficient way by which you can remove Linux Partition from your Dual Boot XP/Vista/7.
Follow the simple steps:
1. Download easyBCD
2. Install it
3. Open it
4. Go to BCD Deployment
5. Select the MBR of XP/Vista/7 you installed as Dual Boot
6. Click on Write MBR
7. Restart it, there won’t be any Grub Menu for choosing the OS.
8. Start the computer with the OS with XP/Vista/7
9. Right click on icon of My computer
10.Click on Manage
11.Go to Disk Management 12.Delete the Linux Partition and Merge it with the existed windows partition