MSXML ClassFactory cannot supply requested class Error

I'm having an issue trying to call a web service from stored procedure.

sp_OACreate 'Msxml2.ServerXMLHTTP'

The error code is 0x80040111 - ClassFactory cannot supply requested class

The source returned when I run sp_OAGetErrorInfo is msxml3.dll

I found msxml3.dll in \Windows\System32\ I have tried to register this dll using regsvr32.exe with no help.

Any thought would be appreciated.

Thank you.

EDIT: The server has the followings installed Windows Server 2003 R2 SQL 2008 R2 Internet Explorer 8

Just an update. The problem seems to resolve itself. It could have been after a server reboot. I have to continue to monitor it.