Quicksilver will not open on my Mac (OS 10.6). Can you help?

Question

I installed Quicksilver and due to some problems I have with the "shelf" feature I decided to uninstall it (using appCleaner).

When I tried to install it again the application wouldn't install the second time and it gave me this option

"The previous version of Quicksilver was located in "Quicksilver 3". Would you like to move this new version to that location?"

I clicked "OK" and the QS logo came up but disappeared within seconds.

There is no file on my computer with the word "quicksilver"

Is there anything you can recommend I do?

I am new to the Mac (got it only 2 day ago).