IIS Enable 32 bit applications "HTTP Error 500.19 - Internal Server Error"

http://forums.iis.net/t/1149768.aspx

"You cannot get rid of it for that site - compression schemes are registered globally - to get rid of the scheme altogether, run below
%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-[name='xpress']"