How do i bring up console in steam version of the game?

PLEASE HELPZZZZZZ

The same key.

Open the Fallout.ini in notepad and find the
bAllowConsole=0
line. Change the 0 to a 1 and save.

Edit: If that doesn't work there is some horribly annoying fix. You have to uninstall Infrared Devices or something, and every time you restart your computer they re-install (in my experience, least). I'll look it up.

http://fallout.wikia.com/wiki/Talk:Fallout_3_console_commands#Troubleshooting

It's common for Vista users and some XP users to be unable to access the Console. Following are some possible causes & solutions: "Infrared Device" drivers interfere with the "Tilde" (~) key being able to access the Console, so must be disable/uninstalled. Here's a direct quote from Bethesda Softworks Technical Support: "If you have a new system with the Microsoft eHome devices, these will conflict with the program being able to read the scan code for the tilde key from the keyboard. Those Microsoft eHome devices or drivers need to be disabled in order to allow the game to "see" the tilde key being pressed. The MIRC (Microsoft Infrared Remote Control) seems to disable the tilde (~) key in both Oblivion and Morrowind. Simply disconnecting the MIRC from the USB port will fix this issue." To Unistall/ Disable the conflicting device(s), try the following steps: Open up the "Start" menu, go into "Control Panel" > "System and Maintenance" > "Device Manager". Click "Human Interface Devices". If you see "Microsoft eHome Infrared Transceiver", right-click and uninstall it. If not, then locate the driver with the word "Infrared" in it's name elsewhere in the Device Manager and uninstall. Unfortunately, when you turn-off and then restart your pc, it will automatically reinstall the driver. As a result, you'll have to repeat the uninstall procedure whenever you go to play and wish to have access to the Console.