Quote: Originally Posted by limneos
If you already have XP and Windows 7 and you need to delete the boot entry, download EasyBCD. Works under XP too and manages Windows 7 and Vista boot entries.
Ok for anyone who has XP and Windows 7 dual-boot, and for whatever reason you need to remove Windows 7 and reformat, here is a way you can remove the Windows 7 boot-loader and still have a fully working XP, and it does not require third-party software ( I have personally done this procedure on my computer to remove Vista/Server 2008 from the dual-boot, so its safe ) :
" Uninstalling Vista If You Have a Dual-Boot System: Both Windows Vista and Another Operating System (e.g., XP) Are on the Same Partitioned Hard Drive
As you have two operating systems on one partitioned hard drive, you can easily gain access to Vista to remove it. In this case you will not need an MS-DOS boot CD. The only thing you will require to remove Vista from a partitioned disk drive is your Windows Vista DVD. It is important to back up any files that you want to keep, because all files on the Vista partition will be erased during this process.
Note: For this tutorial, we are using the configuration of a partitioned hard drive that has Windows Vista on one partition and Windows XP on the other.
Step 1. Start up your computer, and once in the boot menu, select Windows XP.
Step 2. Insert the Windows Vista DVD into your DVD drive and launch Vista. Once Vista is launched, close any menus that might open.
Step 3. Click your start menu and then click on Run. Once the Run menu opens, input the following command: e:\boot\bootsect.exe /nt52 ALL /force. Note that the letter "e" corresponds to the drive letter for the DVD-ROM in which the Vista DVD has been inserted.
Step 4. Now, restart your computer, and once in the boot menu, choose Windows XP. You will now reformat the part of the drive that Vista was installed on.
Step 5. Once the partition where Vista was installed on has been reformatted, you will need to delete two specific files: Bootsect.bak and Boot.bak. These files can be found in your Windows XP root folder.
Once these two files are removed, the uninstallation of Vista should be complete. "
You can find this whole article here : How do I Uninstall Vista?
PS : this article describes how to uninstall Vista, but it is the same procedure for Server 2008 and Windows 7