Watsapp APK installer reboot's Android and dont install..

OK.. so.... this morning my phone awoke with a whatsapp warning in the notifications bar... something about the chats ...
i do not pay much attention .. I had a backup made 2 days ago... and i go direct to Titanium Backup to restore it...
so y open Titanium Backup... y do "unistall" to whatsapp... no problem there..
I do "restore" ... "app+data".... still normal....
the classic APK screen appears to install whatsapp... i do "install"...
And instantly ... the "DROID" screen appears.... like if i just turn on my cell phone...
Android boots up... apparently normally... and the disaster begins...
"Unfortunately Contact has stopped."
"Unfortunately android.process.acore has stopped."
"Unfortunately Google Play Services has stopped."
and whatsapp is not installed.......
I think whatsapp screw up the phone contact list app...
i try to restore de backup again...
the classic APK screen appears to install whatsapp... i do "install"...
the cell phone reboots instantly....
i try to download a clean whatsapp from Market.... give me a 402 error...
i download a whatsapp APK with the PC put it on the SDCard...
the classic APK screen appears to install whatsapp... i do "install"...
the cell phone reboots instantly....
any idea how to fix this mess...
:crying:

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