Reinstalling J2EE Engine

Hi all,

We have WAS 6.20 and its J2ee Engine was giving us some errors when we tried to run it.So I uninstalled the J2EE engine.Now can anyone one suggest the steps that we need to be follow while re-installing the J2EE Engine and also is it possible to install the latest version of WAS without causing any damage to the present system.If it is possible kindly suggest us the procedure.

Thanks and Regards,

vijayasai