Have root. Tried "autorun manager" app which gives option to display system apps & uninstall, but still said "uninstall not successful"
2 Answers
I quickly read the description of Autorun Manager, and it doesn't mention the ability to uninstall system apps, but there are several apps that can do this, for example Root Uninstaller. Do a search on the Play Store for "root uninstall" for more.
If you already own a copy of Titanium Backup you can uninstall a system app with this tool too. Anyway Root Uninstaller mentioned by onik seems to be free and therefore cheaper as Titanium Backup Pro (if you haven't already bought it).