OBIEE Presentation Server Error::: Unable to start Oracle Presentation Service

Some time you get error like... Windows is unable to start Oracle Presentation Service:

Check the sawlog [D:\oracle\bise1\bidata\web\log], If it contains error like ...

-----------------------
Type: Error
Severity: 10
Time: Wed Jan 11 14:42:29 2012
File: project/webcatalog/catalogimpl.cpp Line: 734
Properties: ThreadID-2584
Location:
    saw.webextensionbase.init
    saw.sawserver
    saw.sawserver.initializesawserver
    saw.threads

Invalid item \\?\D:\oracle\bise1\bidata\web\catalog\paint\root\system\mktgcache\umirza\sawguidstate.atr.
----------------------

Then try this ...

Copy the sawguidstate.atr and sawguidstate file from the path
%\oracle\OracleBIData\web\catalog\samplesales\root\system\mktgcache\
to
%\oracle\OracleBIData\web\catalog\samplesales\root\system\mktgcache\<hostname>

the service can start now.

Cheers ;)