So i've had Oblivion installed for a few months, and have never encountered these problems before.
1. when playing the game, my mouse will occasionally peak through the corner, and if i click it'll minimize Oblivion and switch to a different window i have open. I've tried playing when all my windows are closed, but the same thing happens. I was able to temporarily fix this by Ctrl-Alt-Dlt'ing and returning back to the game. And while this fixes it, it leaves a brownish line around the right to top edge of the screen.
2. after loading a game, i try to jump but it ends up in a roll. I thought this was just because I was blocking at that moment, so I quickly right-clicked to try to get it off. Unfortunately all this did was raise my weapon into a permanent blocking stance. I can't put my weapon away, switch weapons, jump, etc. Plus it lowers disposition and i'm using up gold and time like a mother.
Any advice on how to fix these problems?
do you have mods? if so post your load order.
Also do a virus scan, that automatically exiting out thing doesn't seem good.
Try running EndItAll(google will find lots of sites for it) before you run Oblivion. It'll close everything in the background, plus it tells you everything that's loaded in an easier to understand format. Not having all the junk running helps alot and speeds up Oblivion. I've used the newer versions, but actually prefer the original. Good Luck.