I did the obligatory search and found nothing on this type of issue...

I was looking for an app with a timer for the camera on my Droid 2. Found a free app, and started the download. During the download, I got a text message from my girlfriend, and the download stopped at 89 percent. It would not complete the download. So I cancelled and tried to download the app again, it downloads, and says "installation failed". Tried several times. I even went to settings/applications/manage applications and wiped cache for the market and market downloader. Rebooted phone, and it will still not install. Says "installation error, unknown reason-18"

Anyone have any suggestions?