Songbird won't start nor let itself install anymore

Yesterday Songbird wouldn't start. But it was showing in the Task-manager. Strangely enough, it always had CPU 50% (all the time, not like the usualy 2-5%)and I waited for an hour without doing anything. Stil, nothing happened. Then I tried to install another version (I had 1.3) and even uninstalled Songbird manually.

"An older version of Songbird is installed; only one version of Songbird my be instaled at a time. Do you wish to uninstall it and install Songbird x.x.x?"

I kept klicking "Ja" (yes) and the same message keeps on appearing. I thoughtmy PC is pranking a little joke on me, but usually this doesn't happen, when I wait another day. Why doesn't it get installed? :(

I really hope you can help me... until then, I think I have to listen my music on iTunes... -__-"
Thanks a lot in advance.