I have been fooling around with Diskeeper and Avast filters in XP_SP3 for some time now, because the way at least Avast (its filter drivers) is set up does slow down the system. I have found out that just for the XP_SP3 M$ really messed up fltMgr driver because filter needs to be in the exact group and within its altitude range, which is way different than in XP_SP2 or in even Vista and all WinNT 6.x. Therefore I would like to know if there is a newer fltMgr.sys driver that allows normal (not so restrictive) mini-filter behaviour (altitude freedom basically) in/for XP_SP3? E.g.: DKRtWrt @ 137100 (its native altitude as per M$'s own list) even though it's "Group" is "Activity Monitor". Current version is 5.1.2600.5512. I tried transplanting it with Vista's (doesn'tworkstation) and XP_SP2 (works but lacks certain functionality).