HTTP 400 Bad Request (Request Header Too Long) - Error in SharePoint

One of the End-User started seeing this error in SharePoint 2007 - InfoPath form submission.
Bad Request (Request Header Too Long)

Resolution:
1. Try deleting the browser cookies at the Client browser first. See whether it helps.

2. If not, implement the fix as per KB: http://support.microsoft.com/kb/920862/en-us
Save the below registry entries to .Reg file and merge it simply!

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters]
"MaxRequestBytes"=dword:00500000
"MaxFieldLength"=dword:00065534

Restart the server for the changes to take effect, and as always take backup before making any registry change.