About manually deinstallation of Step 7.

Dear All

I have manually deinstalled the Lower version of Step 7. As per the guide line, like how to delete the registries and folder, as In my PC I didnt have option of removal the lower version (In Add remove Program in Control Panel).
But still I can not completely remove the lower version.

Please can u give us some guide line about the same?

Regards
Ankur