I cannot understand why MSXML will not work correctly on some PC's but does work on others. Basically we're constructing an XML message and sending it off to a server. I get this error message: "The requested header was not found". Using version MSXML3. The problem seems to be linked to the Internet config of the PC (maybe a proxy-server problem?) or how MSXML is installed/configured, as it only happens on some PCs in the facility. Help please!