Users that attempt to deploy Microsoft Security Essentials 2.0 might come across an issue where the installation process hands, especially if they have been running the first version of the company’s free security solution for Windows.
Essentially, the deployment process would not reach completion and customers could be presented with the following error: 0x80070643.
It appears that MSE 2.0 could also simply “refuse” to install without even displaying an error to users.
“I ran into a little issue with it not installing correctly on one of my home machines running Windows 7. The first time I let it try to upgrade itself I ended up with an error 0x80070643.
“What I was then finding on subsequent attempts to install it was that when I commenced the install (by running the mseinstall.exe package) I would see mseinstall.exe in task manager but nothing would happen.
“Task manager showed that the mseinstall.exe process appeared not to be doing anything – it was “hung”,” revealed Microsoft’s Doug Stewart
As I’ve mentioned above, the problem seems to be related to Microsoft Security Essentials 1.0.
In this regard, users that have had MSE 1.0 removed it, might find that MSE 2.0 will not install. This is because MSE 1.0 failed to fully uninstall correctly.
Fortunately enough, Microsoft has KB 2435760
to help customers, even providing them with an automated Fix It solution.
“If you think you might be hitting this issue there is now a KB article that details steps for manually uninstalling MSE v1.0 from your system,” Stewart stated.
“Even better news is that this article has a “FixIt” associated with it. The direct link to the US/English FixIt package can be found here
(although you would be better to follow the FixIt link in the article so you get the correct FixIt version for your language/locale).”