Is your firmware up-to-date?http://europe.nokia.com/support/download-software/device-software-update/can-i-update
Did you try resetting it?
Soft reset/reformat - Type *#7370# and the phone's lock code (Nokia default lock code is 12345). Warning!Soft reset wipes the C drive/phone memory!
If you want to thank someone, just click on the green star at the bottom of their post