The easiest way is to put your operating system disk in the computer and do a repair. If you have XP, then it is a nightmare and to long to explain, your better off, doing a install of the OS, then making sure system restore is on and making a restore point. But if you want to try and you have XP, below ill post a repair for the boot. http://pcworld.about.com/magazine/2111p196id112479.htm This is for recovery console. http://support.microsoft.com/kb/314058 Vista and windows 7 are very easy to fix the MBR, you just put in the disk and it will repair it for you.
Well U Have To Suck It! LOL!
MBR (Master Boot Record) program.
The first sector of a floppy disk or logical drive in a partition; it contains information about the disk or logical drive. On a hard drive, if the boot sector is the active partition, then it is used to boot the OS (Operating System; i.g Windows Vista is an OS). Boot sector is also called the boot record.
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A Master Boot Record (MBR), or partition sector, is the 512-byte boot sector that is the first sector ("Sector 0") of a partitioned data storage device such as a hard disk.( from: http://en.wikipedia.org/wiki/Master_boot_record )
MBR Master Boot RecordA Master Boot Record (MBR), or partition sector, is the 512-byte boot sector that is the first sector ("Sector 0") of a partitioned data storage device such as a hard disk. ( from: http://whitehouse.com)
The BOOTMGR (Boot Manager) is stored in the boot sector of the system partition on a Windows system. It is typically located in the first sector of the hard disk.
Resolves sector problems on a file or a disk
On a partition on your hard disk. It is launched by bootloader located in so-called boot sector.
If a virus persists on a PC even after formatting it is likely that the virus has been inserted into the boot sector of the hard drive - which is not rewritten when you re-format it. Assuming you are running a Microsoft OS, to fix it, boot using the install CD for the OS and run the first Repair option which will load the Recovery Console from a ramdisk (and doesn't use the hard drive for booting). This requires that your BIOS supports booting from the CD drive. Then run the 'fixboot' command. This is supposed to overwrite the boot sector. You may have to specify the drive letter of which partition to fix.
A boot sector virus is a computer virus that puts itself in the boot sector of a computer. The boot sector is the partition on the disk drive that contains all of the programs and files necessary for the computer to start up. This ensures that the virus will be executed once the computer is turned on.