Rumtime.exec Problem

I am executing a file through Rumtime .exc ... Some day before it is working very well but now a days it create problem.... it generate folowing Exception

java.io.IOException Runtime.exe create process error=5

Even i am opening Notepad this exeception is raise... i admin rights on PC... Command that i use for executing notepad is

Process process = r.exec("C:\\WINDOWS\\system32 Notepad");

kinldy give me some advise as soon as possible

[469 byte] By [kashifAzhara] at [2007-10-3 0:45:50]