Could not write value to Key in registry during installation in windows server 2003

I am using Windows 2003 server sp2 protected with Mcafee Enterprise edition antivirus recently I faced an issue during installation of programs like Microsoft Office or VS 2008.I thought it had to do with security in windows that is why it is unable to access.But to my amaze I wasn't installing any 3rd party software it was all Microsoft.My doubts raised on my antivirus

I went to the antivirus console and turned off Access protection as shown in the image and it solved my problem