having a problem just now with windows defender been runnin' it now for ages with no problem now all of a sudden i'm getting windows shield offering update KB15597 (definition 1.18.2547.1) I can download it but it won't install(keeps failing) then on opening WD home page i get the following Error Found: Code 0x80070643 i've uninstalled WD then reinstalled but still get the same prob I've had to uninstall it because the update shield keeps reappearing offering the same update any help would be great thanx

Why are you still running beta version (KB15597)? Uninstall it and get the latest production version HERE. BTW The beta version has expired December 31st. i_XpUser

what do you mean beta version? i clicked on your link downloaded this version installed it windows offered an update (KB15597) downloaded it it failed to install (Error Found: Code 0x80070643) so i'm back to where i started & just wasted 10 minutes but thanx anyway does anyone else know what the problem could be

broxibearz: Go to the website below and download this latest version. But, before you install it, I am curious how do you delete the original install? Besides the normal Control Panel Add & Remove programs removal, do you go into Windows Explore and delete all remnants of the original install? Also, do you check the Registry for additional entries of Windows Defender? If you are not familiar with the Registry, then don't mess with it. Do the rest and then try installing this new version. http://www.filehippo.com/download_m...

Thanx gilloz but this is the version that i've been installing ok i remove it via ADD/Remove then in explorer i remove a folder in Windows/software distribution/download/install that i was told to remove in an other forum then i use CCleaner Systweak System Cleaner (which includes reg cleaner & fix) RegSeaker Microsoft RegClean WinCleaner One Click Cleaner then just to make sure Evidence Eliminater but when i try to install it again i'm still getting the same error code& can't update message

Broxibearz: I found the following on the Microsoft forum. See if this helps you. Navigate to C:\program files\windows defender and delete MpAsDesc.dll After you delete that file, try that update again.

Thanx gilloz done what you said still no joy the following updates were not installed: KB915597(definition 1.18.2621.7) i've uninstalled it it's driving me crackers next time i format i may install it again but thanx anyway cheers Broxi.