After installation KB2964358, IE9 won't work anymore and shows the Download-box for every webpage.
I read about one known issue for KB2964358 and that's IE11 related.
We deployed this update company wide fairly quick because of the vulnerability risk and a lot of workstations have this effect.
Workstations are Vista SP2 32-bit and Win7 SP1 64-bit with IE9 and Microsoft SCEP 2012 as antivirus.
We guess there is a possibility it has to do with IE9 being deployed through SCCM via WSUS, seen a vague post about that but how to remediate this so we can get that update installed?
We're still gathering information, I'll update this post with more facts