I have a new PC with Windows 7 on it. After discovering that I could not run some backup functions (error stop 0x80070424) I found that wbengine was missing from the registry. With some help from this forum I imported a wbengine file into the registry and everything worked fine. A day later the wbengine file was missing again, something had deleted it.Dell PC TuneUp is active on the PC along with Avast antivirus. I am suspicious that one or the other may be involved but as yet have no proof. Or is something else going on?Any ideas?Eric

Search for and try the Microsoft Seecurity Essentials, its free and can replace Avast. Then try your backup and see if it works OK.Vote if answered or helpful, I am running for Office (joke)! IT/Developer, Windows/Linux/Mainframe Server: P4-2GHz, 1.5 GB RAM, Linux Server, need IDE/SATA disks for my chess site Workstation: Asus M2NBP-VM CSM, Athlon64 X2 4200+ 65W CPU, 2GB RAM, NVIDIA 8600GT, 320GB + 160G backup, Windows 7 Ultimate x64.

Thanks for the replyI removed the antivirus as suggested, replaced the wbengine file and waited. The Dell PC TuneUp kicks in periodically to de-clutter the PC including the registry. After PC TuneUp had next done its thing I looked in the registry and found wbengine missing again. PC TuneUp has a history file which indicated that a registry problem had been fixed; no specific info. I have reported the problem to Dell (not an easy thing to do!) and am waitinga response.Nil desperandum.EricFurther update.I have managed to configure Dell PC TuneUp to ignore the wbengine registry value and it now runs without deleting it.