When trying to install EventSentry I get the following error: "Internal Error 2755. 3,".

This error can appear when running the setup either from the network or from a nested directory, that is a subdirectory beneath many other subdirectories. This is unfortunately a known problem with the Windows installer.

To void this problem please copy the .MSI or .EXE file to a directory immediately under the root folder on the local harddrive, for example C:\TEMP.

If you launch the setup file from there again the setup should proceed without problems.