Problems after Lyx-installation: lyx produces one white page

[Robert Neumann]

Hello,
I had lyx 143 running on win xp and everything went fine.
Now I reinstalled lyx (with all miktex and so on) because I rearranged my 
harddrive.
If I now want to create a pdf of an existing file using ps2pdf, I get only a
blank page. dvi and pdflatex works. Unfortunately I need ps2pdf...
Obviously there is something wrong, but I don't know which programm to uninstall
an reinstall again.
Thanks
Robert