cannot uninstall named reporting service 2005

I needed to re-install the entire sql server 2005, I used add/remove program. everything went normal, except reporting service. I deleted the entire upper sql server directory, rebooted the box, however, it still shows up in services, even though the path does not exist. I tried to reinstall it again, but it complains about name already exists. I cannot change the name, but I am not able to find how I can remove it and reinstall it properly.

Last Action     : DetectInstanceClash

Error String    : An instance with the same name is already installed on this computer. To proceed with SQL Server Setup, provide a unique instance name.

Error Number    : 28086

JulieShop