Clever, isn’t it. I was trying to install Microsoft Security Essentials on a laptop running Windows XP Professional; installation kept failing with error 0x80070643. Picked up hints around the web that other anti-malware programs might be interfering. I had already uninstalled Avira AntiVir Premium, but though I might as well try getting rid of Microsoft AntiSpyware.
Surely these two Microsoft security products couldn’t be conflicting with other…surely not…oh. Yes they could, it seems. Removed Microsoft AntiSpyware and Microsoft Security Essentials installed with no problems. Something for Microsoft to sort out, I think…
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Had this error message on two occasions, in one case had to install SP3, in other case, this post helped me, many thanks!
Been pulling my hair out with this same problem, and your recommendation worked for me! Thanks.
So many suggestions on the web, only this one worked for me, thanks for posting.