I've searched the forums and can't seem to find a precedent.

BIoshock for the moment seems to be working OK - I have to run the damn thing at the lowest graphic settings, but aside from a few tiny black-screen-of-deaths it seems OK. Except for one thing.

Every time something pops up on the desktop while the game is running - antivirus, updates, someone signing in to chat - the game pauses for a second and goes to smaller screen (ie, as if I'd half minimised it so I can see part of the desktop). This occurs even when I do something innocuous like adjust the volume.

I fix it by going into graphics and changing the resolution, which puts it back into full screen for the time being.

An annoying problem. Can anyone help? The machine runs Vista and the card is an Nvidia G400

(I am definately not good with computers, even though I love shooters, so explanations in layman's terms please!)