mobile

I've rooted my Galaxy Core(GT-I8262) using Framaroot and haven't installed any Custom Recovery. Today I got a new sdcard and installed it properly and installed My Backup Pro and after that I am unable to install any app( tried playstore too) it shows error" the app couldn't install free up some space and try again" where I have 10GB free space in SD and 2 GB free space in internal memory. I thought about factory reset but I'm afraid to do so as I've rooted it...pls help:(:(