Never mind my previous post, Oblivion is running again, better then ever!
While trying to find a solution for my problem i found a usefull tweaking guide. Here it is. there are a lot of usefull things in there, like one of the tweaks you can make is to show a health bar above the person/creature your attacking, instead of the half circle round your cursor. Another one of those tweaks is a program callled "coolbits" usefull for Nvidia Geforce 6xxx and lower cards. if there is anyone who has a geforce 6xxx or lower, could you try this and send me a message about how good it is, because i'm no longer allowed to 'download' stuff, unless i'm sure it's really safe.
which brings me to another point: is there any one who can send me a zip-version of the official horse-armor mod. My emailadress: lamart92[AT]hotmail[dot]com