I forgot to mention you had two antivirus programs installed,namely AVG7 and Symantec.You`ll need to remove one of them as they will fight for control,slow your system down and in the end this could lead to a system crash.
If uninstalling Symantec/Norton download and run the
Norton Removal Tool.You can uninstall AVG7 from add/remove.
Remove one of those programs before you boot into safe mode.
As for AVG antispyware,just ignore that part and carry on with the rest of the instructions.