extras devel repo is bad news unless you are an advanced user and want to go cleanin out crap manually after uninstalls and most of it isnt optified but dont worry. .

the easiest thing you can do is complete reflash.... see below.

Remember to bacl up data etc. there are other options available to try but im tired (a search may yield info)

http://discussions.europe.nokia.com/...ata/m-p/591877