ServiceDesk server shutdowns automatically

Hi,
My ServiceDesk shutdowns automatically after a interval of few days and the only solution to start it again is server restart. After diagnosing i could find out that the java.exe process utilises lot of memory, when it reaches around 370000K Mem Usage it then shutdowns the Servicedesk. And after restarting the server the java.exe process utilises around 194000K Mem Usage and i noticed that day by day it goes on increasing and again when it reaches at around 370000K Mem Usage it automatically shuts down.

Please find my Server Hardware details below:
Intel Pentium IV 3.40GHz
2GB RAM
160 GB HDD
Windows 2003 Server with SP1

ServiceDesk Version: ManageEngine ServiceDesk Plus V6.0.0 Build:6013

This was upgraded from Version 5.5.0 and only after upgradation this problem has arised.

Thanks in advance