It's all right.
I guess I should go backstabbing those pesky aimbotters...

What's the name of your server?
I have never tried DICE BOOM before. It'll be interesting to get the feel of the battlefield DICE employees' way.

DICE BOOM is an ammo upgrade for shotguns and snipers. It is explosive shells for shotgun and anti-material bullets for sniper rifles.
It is reserved for DICE employees as a compensation for being bashed everyday by gamers who are not so satisfied with Origami and Bettlefold.

Turn down graphic effects maybe? Never heard of this kind of problem...
What kind of freeze do you get? All the players stop moving or the computer hangs and stop responding?

You know what?
Play the game and profit !

The file is in the "Documents" library in BFBC2.
If you have Windows 7 or 8, look right to the side of Windows Explorer, the "Documents" folder/library is listed under "Libraries".
For XP, I don't know, but it should be similar.
Enjoy !