Before you can install Mount & Blade you'll need to find the serial number that came with the program. Mount & Blade requires that you enter a unique serial number before using it.
If you've lost your serial number, there may be a way to find it as long as Mount & Blade is still installed. You might be able to find your Mount & Blade serial number if you've uninstalled the program but only if the serial number information was left in the Windows Registry.
The Mount & Blade serial number is actually more of a product key than a serial number but the terms are often used interchangeably.
Using a free product key finder program would certainly be the easiest way to find your unique Mount & Blade serial number. Product key finder programs automatically search your computer for the product keys and serial numbers that your software programs store in the registry.
If you knew the exact registry key that stored your Mount & Blade serial number you could find it manually but that information is usually hard to come by.
Most product key finder programs are designed to find serial numbers and product keys for operating systems like Windows 7, Windows Vista, or Windows XP but some of them find serial numbers for several other programs too - programs like Mount & Blade.
The only key finder that I know will find your lost Mount & Blade serial number is Keyfinder Thing.
If for some reason KeyFinder Thing doesn't find your Mount & Blade serial number, give some of the other key finder programs a try from my Free Product Key Finder Programs list. Be sure to let me know what programs did or did not find your Mount & Blade serial so I can keep this page updated.
You should also be able to find serial numbers for Mount & Blade expansion packs like Mount & Blade: Warband.
Important: You may have come across Mount & Blade keygen programs or other kinds of Mount & Blade cracks but keep in mind that these are not legal ways of obtaining serial numbers or product keys. The only legal way of installing this program is by using a valid Mount & Blade serial number obtained through a legal purchase of the software.