I have tried installing both the 32-bit and 64-bit versions of dotTrace under Windows XP x64, and neither version works correctly with Visual Studio 2005. When I install the x64 version, all options related to dotTrace are greyed out/disabled. When I install the x86 versions, I can click on the dotTrace commands, but they always end with "Profiler Not Started! Exit Code: 3". I'm using the latest release versions of both Resharper and dotTrace.