Use the special folders property. No hard coding and it will work with every version.
http://msdn.microsoft.com/en-us/library/s2esdf4x(v=VS.90).aspx
http://www.thescarms.com/dotnet/SpecialFolders.aspx
http://www.dotnetspider.com/resources/6037-Get-all-special-folders.aspx
http://www.vb-helper.com/howto_net_get_special_folders.html