Back in July I ran into an issue with SBS 2011 where many normal Windows processes would launch but never fully execute: msiexec and other installers; Server Console (hang at "Collecting Data"); Exchange 2010 EMC (hang at "Loading Help Files); etc.
With the help of EE, I was able to narrow the issue down to .net F/W 4.5.1.
After many weeks of attempts, I was finally able to uninstall .net and re-install. The issue appeared to be resolved until 2 weeks ago after a .net Security Update was pushed to the server.
I attempted the same steps I had back in July only to completely meltdown the OS partition and had to recover from bare metal using a backup.
I recovered the OS to a time before the recent update broke .net, however I am experiencing the hanging of software again. I cannot install/ uninstall/ repair or do many other necessary functions because of this issue.
Please advise the proper procedure for uninstalling .net 4.5.1 and re-installing .net 4.0
IF YOU DO NOT HAVE EXPERIENCE SPECIFIC TO SBS 2011, PLEASE DO NOT PARTICIPATE. .NET IN OTHER WINDOWS INSTALLATIONS DOES NOT BEHAVE THE SAME AS SBS 2011.
NOTE: THERE ARE NO VIRUSES, ROOTKITS OR OTHER EXPLOITS. THOROUGH ON-AND-OFFLINE SCANS HAVE BEEN PERFORMED FROM: ESET NOD32; PANDA ONLINE SCANNER; BITDEFENDER RESCUE CD; MBAM AND AVG RESCUE CD