Currently Product Key Finder supports 8,000 popular programs and does outnumber the competition. Please take into account which of your software actually uses a license key. Of course we can only find licenses for licensed product, not for Freeware for example. If there is a product key the program will most probably find it. And please don't expect Product Key Finder to recover product licenses from trial versions. 99% of all product license keys are located in the Windows Registry. Only some programs does store their products keys somewhere on the hard-drive in files and Product Key Finder does include a scan of these files also.
No, there are no serials there. When you enter your key with the installation of Window, it is checked against an algorithm to verify the key.
For Windows 8, Windows 7, Vista, Windows Server 2008 operating systems this key may be shown instead of real key, if it is a MAK (Multiple Activation Keys) or a VLK (Volume License Keys). These license keys cannot be recovered since they are not stored in the system at all.
If you purchased your computer with a pre-installed Windows system from a manufacturer such as Dell, HP or Toshiba, it is likely that Windows was installed using an OEM key instead of the actual key for your computer.
Yes, with the exception of Microsoft and Adobe products, because these keys can only be recovered. You can change the Windows product key, but only locally and on Windows 8, Windows XP, Vista, Windows 7, Server 2003 and Server 2008.


If you want to scan one or more network computers you will need to make sure that following settings are set on the remote computer. Depending on the operating system of the remote computer, please check the following:

For Windows XP, Windows 2000, and Windows 2003 Server:

Firewall File and printer sharing should be ON
Remote registry service should be started. NOTE: No longer required since Product Key Finder version 6.0
Sharing and security model for local accounts is set to Classic

For Windows Vista, 7, 8, 10 and Windows Server 2008:

Network discovery and File and printer sharing should be turned ON
Firewall File and printer sharing should be ON
Remote registry service should be started. NOTE: No longer required since Product Key Finder version 6.0
Disable UAC remote restrictions
Sharing and security model for local accounts is set to Classic
 There are several possible reasons, but most common is the Windows Firewall (or any other firewall) blocking Product Key Finder from accessing \\remotecomputer\c$ share in order to login remote. To fix it you may disable firewall or configure it properly. With the Windows Firewall this can be done easily. Enable 'File and Printer sharing'. Here are more detailed steps:

Go to 'Control panel'
Click on 'Windows Firewall'
If its state is "On", navigate to 'Exceptions' tab
Enable 'File and Printer sharing'
This means that the 'Remote Registry' service is not started on the remote machine. This service is not starting by default in Windows Vista and Windows 7. To start it please complete the following steps:

Open 'Control panel'
Select 'Administrative tools'
Open 'Services'
Find 'Remote registry' service, like on this picture:

Services

Double-click on 'Remote registry'
Change 'startup type' to 'Automatic'

Remote registry service

Click on 'Start' to start service.
Click OK.
There can be 3 possible causes:

You have entered username or password incorrect. Please make sure you had entered it correctly.
If your network is in domain, use 'DOMAIN\Username' instead or just 'Username', since remote computer may treat Username as local user.
Sharing and security model for local accounts is set to 'Guest only' on remote computer. This is most common issue, since it is set like that by default in Windows XP. To change it please do following steps:
Open 'Control panel'
Select 'Administrative Tools'
Open 'Local security policy'
On the left pane navigate to 'Security Settings' => 'Local policies' => 'Security Options'
On the right pane find 'Network access: Sharing and security model for local accounts'
Double-click on it in order to change
Set it to 'Classic - Local users authenticate as themselves'

You can also do that in registry:
Press on windows 'Start' button
Click on 'Run...'
Type 'regedit' and press Enter
On the left pane navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

On the right pane you will find value 'forceguest', if it is not there you need to create it, by clicking menu 'Edit' => 'New' => 'DWORD value'
Double click on 'forceguest' in order to change it
Set it to '0'

Reboot your remote computer and try to connect to it with Product Key Finder again.
Applies to
Windows Vista, Windows 7, Windows 8, Windows Server 2008, Windows Server 2008 R2

Resolution
If you received "Access Denied" error while trying to scan remote computer (which is Windows 7 or Windows Vista) with Product Key Finder, this means the UAC remote restriction is blocking it. Please complete following steps on remote Windows 7/Vista in order to fix it:

Click 'Start', click 'Run', type 'regedit', and then press Enter.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
If the 'LocalAccountTokenFilterPolicy' registry entry does not exist, follow these steps:
On the 'Edit' menu, point to 'New', and then click 'DWORD' Value.
Type 'LocalAccountTokenFilterPolicy', and then press Enter.
Right-click 'LocalAccountTokenFilterPolicy', and then click Modify.
In the Value data box, type 1, and then click OK.
Exit Registry Editor.


IMPORTANT
Reboot is needed in order for changes to take effect.

For more information
http://support.microsoft.com/kb/951016
If you receive a "Multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed..." error message while trying to scan a remote computer this means that you are already connected to the remote computer and Product Key Finder is trying to connect again, and Windows does not allow multiple connection from the same user.

To fix this, disconnect all previous connections to the remote computer and try again. If it does not help, please reboot the remote computer and try again.

For more information please refer to this link: http://support.microsoft.com/kb/938120

Do I need to pay once for the software, or are there additional monthly / yearly fees?