If you are getting an error after installing Visual Studio 2005 informing you that it cannot open the currentsettings.vssettings for writing, here is the answer:
Close all instances of VS
Run from the command line where you have find the Devenv.exe file:
Devenv.exe /resetuserdata
After the process is compelete, reboot vs and it should be fixed.
Found this tip at:
http://blogs.msdn.com/astebner/archive/2005/11/22/496098.aspx