iPhoto opens automatically by creating files on Desktop My problem:

iPhoto opens automatically, when I:


Copy and paste any kind of file to my Desktop
Save any file type to my Desktop
Create a screenshot (which is automatically saved to Desktop)


iPhoto doesn't open when I:


Move any file type to my Desktop
Copy and paste a file anywhere in documents (not Desktop)


According to this I think the problem is with creating a file on the Desktop.

When the problem first appeared:

I tried to create a shortcurt to an application and looked through several blogs. I ended up in creating a test-service, which launches iPhoto.
I wanted to map that service to a shortcut, but it  didn't work out... 



What I've tried so far:


I've deleted the service I've created.
I went to System Preferences > Keyboard and "Restored all Defaults" in each category for all the shortcuts.
I've unchecked every Service in the System Preferences.
I went through the Preferences of iPhoto.
I searched Google for like 3 days.


Does anyone has any clue how I can fix this behavior? 

Edit:

Sorry the confusion: the behaviour hadn't anything to do with the service I've created. It was a Folder Action assigned to my Desktop.
Maybe the service is saved somewhere else? As far as I know, they go into ~/Library/Services/ (you can go there by switching to Finder and press Shift+Control+G or select "go to folder" in the Go-To-Menü). 

Maybe you saved your Automator script as "Folder Action"? Have you checked them, too? I think they are visible as a submenu when Control-Clicking on the Desktop.