When I installed "WindowsXP-KB898715-x64-enu.exe", it reported my system had a new version and did not complete the installation. Didn't say which version my system has. For sure it was not 3.1, because the IDE installer insisted I had to install 3.1. I did get the 4.5 version installed. However, the IDE installer still insisted I had to install 3.1. Any idea?