I'm really thankful for any hints.

Please read How do I post a question effectively? and start posting details, for starters

$ pp -V
PAR Packager, version 1.010 (PAR version 1.002)
...*snip*...

$ pmvers PAR::Packer PAR XML::LibXML XML::LibXML::SAX
PAR::Packer: 1.010
PAR: 1.002
XML::LibXML: 1.84
XML::LibXML::SAX: 1.73

$ perl -v

This is perl 5, version 14, subversion 1 (v5.14.1) built for MSWin32-x
+86-multi-thread
...*snip*...
[download]

How you obtained perl, PAR::Packer PAR XML::LibXML XML::LibXML::SAX ...

Output from Listdlls as described in Re: Converting to exe, Re^4: Can't locate loadable module error for XML::LibXSLT on Strawberry Perl

Maybe you need to list extra dlls like described in Re^3: Problem in creating exe using PAR module

On a formatting note, please start sprinkling <P> tags liberally in your posts, after each period is fine :)