Plesk failled to load with a php error message

[Soh NdehJ]

Hello
Is actually 2 days that plesk is down. I have the following error message:
"HTTP Error 500.0 - Internal Server Error
C:\Program Files (x86)\Parallels\Plesk\admin\bin\php-cgi.exe - The FastCGI process exited unexpectedly"

This occure after installation of php 5.3 via plesk following instruction provided here http://kb.parallels.com/fr/113179
After the installation everything works find, but after a server reboot this error message appear and the website who need this version of Php is also down, with the same error message
All other website are working find using php 5.2.

Any idea ?

Problem solved by setting the value of PHPRC to the plesk admin dir.