PHP + XSLT on IIS causes crash

Hello, I successfully installed PHP 4.3.2 on IIS 5 (Win 2000) as a SAPI module. Now I want to add PHP's XSLT-features, but unfortunately haven't been successful in making it work yet. The problem is that as soon as I copy either sablot.dll or php_xslt.dll to a folder in the system PATH (\winnt\system32\inetsrv\) and restart the server, it crashes badly. Killing all dllhost.exe processes ist the only thing that helps then. So, I wonder, are maybe the version numbers of either Sablotron or Expat important with regard to a specific PHP version? Or what else could cause the behavior described above? Since there is not much information in Windows' event log, is there any other place I could look for error msgs? Or, perhaps, is it necessary to copy all .dlls into the system32 folder - and only into system32 - for any reason? I would appreciate ANY hint on how to get around this problem, even the wildest guesses *g* It's kind of annoying that I can't switch to apache this time. Thanks - Matthias