i have a problem guys.my phone is ericsson k800i.

here's what happened..after i synchronized my phone to the pc..i tried to open my applications folder but it just says "operation failed". even my games folder have the same problem.i dont want to do a master reset yet.so could anyone please help me..what can i do? thanks

If ur K800i comes with a memory card, then try to format M.S, but be sure to back up ur files to ur pc, before doing that.. hope that helps, had same problem before.