Okay... The Steam thinks there's 6201.5MB of memory Total when, there isn't. There is 5656MB memory total in Oblivion.... And it only downloaded 5325.5MB of it... And I've constantly been trying to figuring out what the problem is after unintstalling and installing 10 times and its not the x86 program files I've checked that and the HDR is off can someone tell me what to do?

It's not really clear what exactly your issue is. Could you be a lot more descriptive and a lot less vague, please?

Well everytime I play on a DLC, it crashes not only the one save data but all of it, even before I got to it, and im wondering why is that happening.