Reinstalling WAS

Hi all,

Our J2ee engine was giving some errors so we uninstalled and reinstalled it but even after that some important services are missing in the visual administrator list,so we are planning to re install WAS by uninstalling it.We have installed the Present WAS after installing the SAP CRM system.

1.Now can I uninstall the WAS and install it again afresh

2. If I do the reinstallation will it cause any problem for the existing CRM System.

3.our present was is ver 6.20, can i now directly install 6.40 after uninstalling the older one or should I first install 6.20 and then upgrade it to 6.4

Can someone help me out in this regard??.And suggestions for the same would be of great help.

thanks and regards,

Vijaaysai.v