USP 3.36 seem to install a ntdll.dll from XP, please see what happens when you manually downgrade to 4.90.3000 ! Yes, the U98SESP v3.36 changes list does state that NTDLL.dll v5.1.2600.6055 (WinXP SP3) is included, yet i have re-installed this version of the USP a few times and the NTDLL.dll in Windows\System\ remains at v4.90.3000 (WinME). (Perhaps this is a bug in the USP, or maybe the DLL is installed only as part of one of the auxiliary programs.) So it *is* v4.90.3000 on my system. - Doug B. The ntdll.dll v5.1.2600.6055 is installed on C:\ when you select support for the NTFS, else it is the version 4.90.3000.This evening I try the new version of kernelex. Mcv'93