PartMgr and PCIIde entries w/ yellow exclamation marks in Device Mgr

Hi I noticed two entries with yellow exclamation points under "Non plug and play
drivers": PartMgr and PCIIde- both saying Code24 "device not present...not
working...or drivers not installed."

I recently have had a new external USB hard drive hooked up to my system
a few times, a Western Digital My Book Essential series, and installed,
partitioned and formatted the drive from FAT32 to NTFS file system. Since I
never had these error messages showing up in Device Mgr before I started
using the USB external drive, I assume they have something to do with it.
Nothing seems amiss so far with the operation but is this anything to be
concerned about? Btw, these errors/conflicts occur with or without the
external drive attached to computer.

Also using XP event viewer I found these two error messages several times
over the past few days:

1)

Details
Product: Windows Operating System
Event ID: 7006
Source: Service Control Manager
Version: 5.0
Component: System Event Log
Symbolic Name: EVENT_CALL_TO_FUNCTION_FAILED_II
Message: The %1 call failed for %2 with the following error:
%3

Explanation
The service controller could not set a registry entry's value for a function
that it requires for operation.


User Action
Contact your technical support group.





2)



Details
Product: Windows Operating System
Event ID: 7026
Source: Service Control Manager
Version: 5.0
Component: System Event Log
Symbolic Name: EVENT_BOOT_SYSTEM_DRIVERS_FAILED
Message: The following boot-start or system-start driver(s) failed to load:
%1

Explanation
The specified drivers did not load correctly. The driver might not be in the
expected location.


User Action
Do all of the following:

Verify that the drivers are configured correctly.
Verify that the computer is running the most current version of the drivers.



Version: 5.2
Symbolic Name: EVENT_BOOT_SYSTEM_DRIVERS_FAILED
Message: The following boot-start or system-start driver(s) failed to load:
%1

Explanation
The specified drivers did not load correctly. The driver might not be in the
expected location.


User Action
Do all of the following:

Verify that the drivers are configured correctly.
Verify that the computer is running the most current version of the drivers.




Thanks for any help with this! -Bob

DELL Dimension 2400
WinXp SP2
Pent 4 2.53Ghz
1 GB memory