help please...I have attempted many times and failed to install a security update for Microsoft.NetFramework,version 1.1 service pack 1 (KB29729). I receive a failed to install with a Code 66A. I have tried to find an explanation for the code to no avail. This is listed as an important update for vista but I am stumped as to why it won't install.....hopefully someone has the answer? I would be VERY appreciative!!