how to change software expiry date in registry

Method 1
Reinstall the program. This is the easiest method, but highly likely that it won’t work mostly on current modern software, as the expiry check algorithm getting sophisticated by keeping the expiry information on started using date and days allowed for try use plus days left in the trial in the registry or in a randomly named file.
Method 2
Adjusting the clock (date and time) of your computer system before starting installation of trial software to future data, or adjusting the clock to past date after expired trial period. Again, this method most likely won’t work.
Method 3
Use a application installation monitoring software or uninstaller software such as Norton Cleansweep, Your Uninstaller! 2006 and Advanced Uninstaller PRO 2006 to keep track and monitor every changes to the system during installation, and then uninstall and revert the shareware completely to remove all traces of trial expiry data.
Method 4
Backup the registry before installation of software, and restore the registry after trial period passed. Only works on those shareware that store protection information in registry, and you will lose some important registry changes by Windows or other applications. Alternatively, use Regmon to monitor registry activity in real-time to identify possible candidates for trial expiry reg keys, and then delete those keys.
Method 5
Reinstall windows, and you can be sure that you can use all trial demo shareware again, as all dummy registry entries and dummy files that store trial information are wiped off.
Method 6
Find a crack, with the help of cracks search engine such as Astalavista. But this is not extending the trial period of software.
Method 7
Search with various search engines such as Google and Yahoo! for application-specific known workarounds. Answered Apr, 14 2011

in the lineview sourceprint?1 reg = Registry.Users.OpenSubKey("S-1-5-21-1757981266-861567501-682003330-500\\Control Panel\\International",true);

you are not geting any object instance
put a breakpoint there and see wheter you are geting or not
else
go to run and type regedit and find the key in hklm/users and check whether it exists or in some other format Answered Dec, 06 2010

1. First of all, download and extract the ZIP archive to one of your hard drive partition.
2. Right click on DriveLetterView, and select "run as administrator".

3. In the interface of this program, you can see a list of all your hard drive, CD, DVD and USB drives whether the drive is connected to your computer.

4. Then select one partition, and right click on it.
5. Select "Change Driver Letter".

6. In the new window, type your new letter, and then click "OK" button to save your changes. Answered Apr, 02 2011