It's easy to fix but you should have important files backed up before overwriting your MBR.....just in case.
Easy way:
Repair the master boot record by using the FIXMBR command from the Windows XP Recovery Console.
Quick Way:
Boot into dos with a Win98 boot floppy.
A:\
dir
fdisk /mbr
I've used this way several times and it works just fine.
Cautious way:
# Restart your computer in safe mode. To do this, press the F8 key while Windows is starting. Then, create a Windows XP boot disk to start the computer.
For more information about how to create a Windows XP boot disk, click the following article number to view the article in the Microsoft Knowledge Base:
305595 (
http://support.microsoft.com/kb/305595/ ) How to create a bootable floppy disk for an NTFS or FAT partition in Windows XP
315222 (
http://support.microsoft.com/kb/315222/ ) A description of the Safe Mode Boot options in Windows XP
If you can start the computer from the boot disk without receiving an error message, the damage is limited to the master boot record, the boot sector, or the NTLDR file. After Windows XP is running, immediately back up all data before you try to fix the boot sector.
Use Disk Management to view the partition information and to verify that the disk partition (or partitions) is correct. To use Disk Management, follow these steps:
1. Click Start, right-click My Computer, and then click Manage.
2. Expand Storage, and then click Disk Management.
If invalid partitions are present or you cannot start your computer by using a boot disk, consider reinstalling Windows XP on your computer and restoring your data and configuration information from a recent backup.
If you do not have a current backup copy of the data on the computer, contact a computer specialist to determine the best method of data recovery and configuration.
# Repair the master boot record by using the FIXMBR command from the Windows XP Recovery Console.
