When a client computer is upgraded from SMS 2003 to Configuration Manager 2007 the hardware inventory scan might fail to run on the upgraded client computer. Entries similar to the following appear in InventoryAgent.log on the client computer:
Unknown error encountered processing an instance of class CCM_System: 80041013
Collection: Failed to process mandatory data item for class: CCM_System. Cycle abandoned !! InventoryAgent
Failed to process instances of CCM_System: 80004005
Solution: Restart the client computer after migration!