RockXP is another free program that retrieves lost product keys from the registry.
Advantages include small program size, no installation required, and additional features such as a password generator and password retriever.
Finds Keys for Operating Systems: Windows XP (officially) and also Windows Vista, Server 2003, 2000, ME, and 98.
Finds Keys for Other Software: Microsoft Office 2007 and Office 2003.
SterJo Key Finder is another key finder that finds product keys for over 500 games and software on either the local Windows install (your computer) or a remote one.
Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2008, and Windows Server 2003.
Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, Office XP, Microsoft Money, Microsoft Works, and lots of other Microsoft and non-Microsoft programs like Adobe, Autodesk, Cyberlink, and others.
SterJo Key Finder is a great way to find product keys because the program is easy to read, you can search through the results, and it supports a huge number of products.
Unfortunately, SterJo Key Finder found two different product keys for one of the programs on my computer, which makes it hard to recommend above some of the other programs in my list.
Product Key Finder won't win any creative name contests but that's not important - it's a very good key finder program.
I like Product Key Finder because it's designed very well, instantly finds product keys, allows an easy XML or CSV backup of keys found, and also lets you change your Windows registration or product key right from the tool.
Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows Server 2008 & 2003, Windows XP, and Windows 2000.
Finds Keys for Other Software: Most Microsoft Office and other Microsoft programs, and many non-Microsoft applications.
14. MSKeyViewer Plus
MSKeyViewer Plus is another good product key finder program.
Major advantages include a really small size, no install needed, and super easy interface. MSKeyViewer Plus instantly displays product keys - no scanning of your registry required.
Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, Windows 95/98, and Windows Server 2008 & 2003. 64-bit versions are also supported.
Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, Office XP, Office 2000, plus a long list of other Microsoft and non-Microsoft programs.
Though the other Windows 8 compatible programs from this list were able to find the product key for my installation, MSKeyViewer Plus wasn't able to do so.
I'd probably pick several other key finders before MSKeyViewer Plus, but if you're having trouble finding a specific key, give MSKeyViewer a try.
15. Free PC Audit
Free PC Audit is a system information tool that shows not only hardware information but also product keys for several Windows and Microsoft Office installs.
It's very small, completely portable, scans automatically, and lets you easily copy out product keys.
Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, Windows XP, and probably older versions as well.
Finds Keys for Other Software: Microsoft Office 2013, Office 2010, 2007, Office 2003, and likely some older versions, as well as some Adobe and Corel software.
Because there is so much other information shown in Free PC Audit, it can seem very cluttered if you're using it just for finding product keys.
Lazesoft Windows Key Finder is another free program that can find the product key for many Windows installs and Microsoft Office versions.
The program is small, completely portable, and simple to read. You can print or save the product keys to a file.
Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, and Windows Server 2012/2008/2003.
Finds Keys for Other Software: Microsoft Office 2013, Office 2010, Office 2007, Office 2003, and Office 2000.
Though Microsoft Office 2013 is supported, I was unable to use Lazesoft Windows Key Finder to locate it in Windows 8 or Windows 7.
geProductKeys Finder might be the most simple key finder program I've ever seen. If all you're after is a quick product key display in Windows XP, geProductKeys does the job.
Advantages include a super small download, no installation needed, and as I mentioned above, a very simple interface.
Finds Keys for Operating Systems: Windows XP (officially) and possibly some older ones. geProductKeys does not work with Windows 8, Windows 7, or Windows Vista.
Finds Keys for Other Software: Some Microsoft Office programs and a few third party programs as well.
Note: You may have to disable Data Execution Prevention to use this program in Windows XP SP2 and later.
Product Key Informer is another free product key finder program but it finds product keys for only a few Microsoft programs other than the operating system.
Finds Keys for Operating Systems: Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, and Windows 98.
Finds Keys for Other Software: Microsoft Office 2007, Office 2003, and Office XP.
Honestly, I didn't care much for Product Key Informer. I think it was the baked-in fields for specific product keys that bothered me. It's a waste of screen real estate and confirms that the program's product key finding abilities are very limited.
Windows Product Key Viewer is another key finder program that shows the product key for several versions of Windows.
You can easily copy the product key out of the program, print the keys, or save them to a file. Additional details are shown as well, such as the product ID, install date, and build number.
Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, Windows 98, Windows 95, and Windows Server 2008/2003
Windows Product Key Finder is only 80 KB in size, is completely portable, and quickly shows the product key.
Finds Keys for Operating Systems: Windows 7, Windows Vista, and Windows XP.
When compared to other key finder programs from this list, Windows Product Key Finder is extremely basic and void of support for anything but the Windows OS.
Also, while it is able to open in Windows 8, the product key it finds is inaccurate.
Game Key Revealer shows the product keys of over 2000 games.
It's completely portable, takes up very little space, and can export keys to a text file or print them off.
Finds Keys for Games: Half-Life, Battlefield 2, Counter-Strike, Mirror's Edge, Halo, Need for Speed, Dead Space, Crysis, Harry Potter, and many more.
In addition to showing the product keys for a few thousand games, keys for nearly two dozen can actually be changed with Game Key Revealer, which could come in handy.
MyKeyFinder lets you save product keys to a PDF file or to the clipboard. You can also send one or more keys to a printer.
You can search through the list of install keys it finds and even blacklist registry keys to avoid finding serials in those locations.
Finds Keys for Operating Systems: Windows 8, Windows 7, Windows Vista, and Windows XP.
Finds Keys for Other Software: VMware, some Microsoft Office products, and others.
While testing MyKeyFinder, I found that a scan takes much longer to complete than any of the other programs from this list. Also, it found keys for programs that don't actually use serials, as well a key for Microsoft Office 2013 that wasn't correct.
Important Product Key Finder Information (Windows Product Keys)
If your system was purchased with Microsoft Windows pre-installed and you have not reinstalled it or upgraded it yourself, a key finder may only find the generic product key that your PC manufacturer used to install Windows.
If you can't locate your product key sticker you'll need to request a new Windows product key.