I'm very tried about uninstalltion of DB2 Enterprise Server Edition Version 8 on Windows 2003 Server.

I uninstalled DB2 in Add/Remove on Control Panel. After that I'm started new instalaltion of DB2 Enterprise Server Editition V8 on the same server. But it is showing me following error :-

"Another version of this product is already installed.
Installation of this version cannto continue.To
configurator remove the existing version of this product,
use Add/Remove Programs on the Control Panel."

After that I had remove some db2 entries from windows registry. But still it is showing me same error. Becauze I didn't seems any DB2 installed package in my Add Remove option.

Can anybody suggest me which parameter need to be remove from windows registry to clean uninstalling db2. It is very very urgent.

Thaking you in Advanced.