You have to be very careful while installing application especially applications that change your system settings. Normally it will prompt you regarding about clashes if you have other application that works as same as the one you going to install, so do read instruction while installing an application. Since you can't find it in the uninstall list, try press and hold the Off-On/Standby button and the home button for more than 10 seconds to do a hard reset. If it's still not working, guess you need to do a restoration, jailbreak and unlock again.

Ok, My Bad...BTW anything by the name "....keyboard...." in the uninstall list?

Not sure this will work but can give it a try, I was Jailbreaking an Iphone for a friend of mine yesterday using the Ziphone 3 cause the Iphone was actually been JB without the "installer" and "ssh" install. Therefore I can't install the "Installer" application using the Winscp and I'm too lazy to search for iBrkr..lol. Pressing the "jailbreak & active" button to re-jailkbreak and reinstall BSD file again and I found out that the files(songs, movies & photo) and contacts still remains intact. If this still not working..restore is the only choice.