Error 1935 during Installation

Summary
When you attempt to install IPSentry, you may receive the following error:
Error 1935. An error occurred during the installation of assembly 'Microsoft.MSXML2,publicKeyToken="6bd6b9abf34378f",version="4.1.0.0",type="win32",processorArchitecture="x86".
 
This error is occurring in the Microsoft MSXML installer and may be caused by either anti-virus or other file detection software.
 
Resolution
Disable Anti-Virus / Anti-Spy ware programs as they may be preventing the Microsoft MSXML installer from writing to the registry. Restart the installation process.