1/ Most important get the latest drivers and software from HP web site (printer seem to have issues with SP2)
2/ Make sure you followed the installation procedure as per HP
3/ Delete that temp dir :-
C:\DOCUME ~1\ADMINI ~1\LOCALS ~1\Temp\WER47e6.dir00
4/ Make sure nothing is loading in the startup folder of msconfig
5/ Run a reg clean program

Let me know how you go
Peter