Why i cannot factory reset my phone Gt-i9000 ?HELP HELP HELPHELP HELP HELP !!!

I have GT-i9000 device. I cannot open any app that is installed in my device. it gives me error when i open any app.. errors {
when i open whatsapp i get error: Whatsapp process com.whatsapp.. and close automatocally after pop up error.
when i open playstore error: google process com.google.vending
process com.google.android.gm
process com.google.android.apps.uploader
and many more errors
}
main errror gives me that com.google.process.gapps something like this... and i can not sync account neither remove gmail account. i factory reset my phone didnt heppen nohting. I factory reset my phone from recovery... nothing happen app wasnt installeddd...
if i delete my apps one by one adn then resart my phone and tht apps i deleted it returns back
I flash with odin my phone nothing happens... i tried to do custom recovery and install cyanogenmod but nothing... i did a lot of things but i couldn't reset my phone...

is there any another way to set my phone ?
Please HELP HELP HELP ME