Remove:
Upper Class Filter: SiRemFil
Lower Class Filter: cdrblock
Lower Class Filter: clbstor
Lower Class Filter: cdrbsdrv
You could probably ditch pxhelp20 too. If anything needs it, just reinstall that app (latest version) so you get the most recent version of it.
Are you SP2 or SP3 of XP? It looks like SP2. Is there a specific reason for this?