Ok, well this is most likely due to what i was talking about before then, various media controllers and other devices, when i say media controllers i mean like a remote for your computer for to controll DVD playback and music and whatnot... Oblivion has a bad history with dealing with outside devices on Vista that should have no effct on your game but for some odd reason do... i would suggest if possible to remove your cricket card while you play, and disconnecting any special USB connections that are not being used expecually if they have nferred censors on them, as these cause themost problems....
keep in mind that oblivion is very resource intensive, and has a long wrap sheet of glitches...
if the problem still exist after this, you may want to look into the '
Oblivion Script Extender' and '
The Nearly Perfect FPS optimizer' as it has the ability to clean the oblivion cache every few loading frames which would greatly reduce this problem by freeing up resources..
hope this info helps... and you can find information on the script extender and the FPS optimizer here:
Oblivion Script Extender &
FPS Optimizer