uno and error at verifying

Hey guys starting today i have this annoying problem i cant verifying or upload my projects to Arduino UNO
i get this message:

In file included from \arduino-1.0\hardware\arduino\cores\arduino\/Arduino.h:212,
\arduino-1.0\hardware\arduino\cores\arduino\/wiring_private.h:33,
\arduino-1.0\hardware\arduino\cores\arduino\wiring_digital.c:28:
\arduino-1.0\hardware\arduino\cores\arduino\/pins_arduino.h:90: error: 'DDRA' undeclared here (not in a function)
\arduino-1.0\hardware\arduino\cores\arduino\/pins_arduino.h:94: error: 'DDRE' undeclared here (not in a function)
\arduino-1.0\hardware\arduino\cores\arduino\/pins_arduino.h:95: error: 'DDRF' undeclared here (not in a function)
\arduino-1.0\hardware\arduino\cores\arduino\/pins_arduino.h:96: error: 'DDRG' undeclared here (not in a function)
\arduino-1.0\hardware\arduino\cores\arduino\/pins_arduino.h:97: error: 'DDRH' undeclared here (not in a function)
\arduino\cores\arduino\/pins_arduino.h:99: error: 'DDRJ' undeclared here (not in a function)
\arduino\cores\arduino\/pins_arduino.h:100: error: 'DDRK' undeclared here (not in a function)
\arduino\cores\arduino\/pins_arduino.h:101: error: 'DDRL' undeclared here (not in a function)
\arduino\cores\arduino\/pins_arduino.h:106: error: 'PORTA' undeclared here (not in a function)
\arduino\cores\arduino\/pins_arduino.h:106: error: initializer element is not constant
\arduino-1.0\hardware\arduino\cores\arduino\/pins_arduino.h:133: error: (near initialization for 'port_to_input_PGM[12]')

but if i try upload that same project on my mega its runs without a problem

Looks like something got corrupted in your installation. Have you upgraded to 1.0.1 yet? If not, now may be a good time to do that sine the other choice is to re-install 1.0.

if i upgrade to 1.0.1 my Norton IS scream that arduno.exe is a virus and if i disable my anti virus the arduino.exe wont start it stops at the main scream