Tested Version: TestVersion-1_2008-03-25
DVBSub2.ax -> popup saying failed MPFileWriter.ax -> no problems
TsReader.ax -> no problems
TsWriter.ax -> no problems
English(United States locale) WinXP SP2 with VCRedist installed with 0.2.3.0 MP-setup.
edit: added US locale info and MFC.dll
UPDATE:
Registration issue got fixed for me by installing:
Download details: Visual C++ 2005 SP1 Redistributable Package (x86)
didn't uninstall the previous one, just started that.