I could not get the latest (2.2) "regular" version of SumatraPDF to install with Kernelex, but in the SumatraPDF forum I found a link to a version of 2.2 which is compiled for Windows 2000. I installed it and ran it using Kex 2000 sp4 compatibility mode and it works very well. It even installs as an option a PDF plugin for Opera which works as well. Here is the link: http://www.zeniko.ch/#SumatraPDF