I installed (or attempted to install) the McAfee windows event collector (Nitro client) ver. 9.10.25296.344 on 50+ 2008 R2 domain controllers. About a third of the installs failed, "An error occurred during the installation of assembly" 'Microsoft VC90.CRT' I can't find anything that would help me fix this.
I have not seen that specific issue with our windows agent installation before but I would check these steps.
First, there is a new 9.1.3 agent version so I would download that and try the installation again.
If that fails, then the issue may be from a MS Visual C++ errror that we occasionally see during agent run time but I have not seen it during installation. Can you check to see if you have this SP installed on those servers. If you already have that or this does not resolve the issue please log a support ticket and we will work with you to resolve the problem. http://www.microsoft.com/en-us/download/details.aspx?id=26368