The zd51145.dll file is part of InstallSheild. This is used for installing software for Microsoft Windows computer. It can be used on mobile devices and handheld devices as well.
The current 2010 version was released in June of 2009 and is supported by Windows 7, Windows Server 2008, and MSI 5. According to Wikipedia, there are 71,000 users.
The zd51145.dll error message is a common registry error. Registry errors occur when the program cannot access the file that it is looking for. Generally, these registry errors go unnoticed and just clutter your computer. However, if you get enough clutter, then your computer will start to slow down and become sluggish.
Other times, the error will prevent the program from working. In these cases, you will need to resolve the error in order to get all functions of the program back to normal.
In most cases, you can resolve a single registry error by uninstalling and reinstalling the program. It should be noted that this would only fix the one error and not all the clutter.
To resolve all registry errors including the zd51145.dll error, you will want to run a registry cleaner. ZookaWare PC Cleaner does this for you fast. In addition, it comes with a 60-day money back guarantee. Not only will your computer be rid of zd51145.dll, but it will be running like new.