Windows Vista and DEP are killing FireFox?

HELP! VISTA KEEPS KILLING FIREFOX BECAUSE OF DEP. What Do I Need To Do?!?. Please Answer ASAP!

Computer specs:

2gb ram

120gb hdd

Genuine Windows Vista Home Premium

dell inpiron 1525

15.4'' screen

Trend mico, Avast!, AVG, and Windows Defender virus protection

Windows Vista and DEP are killing FireFox?network

You can disable or turn off Data Execution Prevention (DEP) globally in Windows Vista. To stop the DEP protection, launch an elevated command prompt shell with administrative priviledges and credentials (log on to Windows Vista with a user account with administrator rights, and then right click on Command Prompt icon and select 鈥淩un as Administrator, or turn off UAC). Then execute the following command:

bcdedit.exe /set %26#123;current%26#125; nx AlwaysOff

If you regret your decision and now want to enable or turn back on the DEP protection, simply use the following command instead:

bcdedit.exe /set %26#123;current%26#125; nx AlwaysOn