On XP SP2 'mshtml.dll' was NOT unregistered along with 'vgx.dll'.
{AE24FDAE-03C6-11D1-8B76-0080C744F389} Enabled Microsoft (R) HTML Viewer Microsoft Corporation Microsoft® Windows® Operating System 6.00.2900.2722 (xpsp_sp2_gdr.050719-1518) ScriptBridge.ScriptBridge.1 Yes C:\WINDOWS\System32\mshtml.dll 4/9/2005 9:17:24 AM