The typical type of crash with Oblivion is something who looks like "The instruction at "0x080adf12" referenced memory at "0x00000000".The memory cannot be "read".
So it would be a good idea to tell us what is your particular error, either by taking a screenshot of the Error popup, or by noting it down somewhere and then writing it on the forum.
This would allow to make a list and to spot common/regular same error that would affect different peoples. These errors could be eventually fixed or worked around once for all with an OBSE plugin for example.
By the way, before reporting a crash, please make sure you are running the last updated version of Oblivion version 1.2.0416. I've noticed many players who were running 1.2.0214 and thought it was the last version until they were hinted by someone it was not the last.
Note: This cannot be applied to Direct2Drive Oblivion version because it is encrypted and different than the retail version.
( I've created this topic in the MOD section instead of the Hardware and Software Issues because the topic will be more seen. )
POST UPDATE: How and when to report the details of a crash:
1. Many errors are created by buggy mods or wrong Plugin Load Order. Try to isolate the eventual mod responsable of the crash. There is already lot of related topics on the forum about this stuff.
If you still are experiencing crash after than then go to step 2.
2. Learn to use the Windows Event Viewer. http://support.microsoft.com/kb/308427/, For http://www.petri.co.il/vista-event-viewer.htm
and also http://support.microsoft.com/kb/947321/
3. When Oblivion has just crashed, open the Event Viewer and look for the most recent errors in the Applications Pane.
There you will spot an error like:
Faulting application Oblivion.exe, version 1.2.0.416, time stamp 0x462392c7, faulting module Oblivion.exe, version 1.2.0.416, time stamp 0x462392c7, exception code 0xc0000005, fault offset 0x000cee0b, process id 0xa44, application start time 0x01c88abd52effc07
Then what you must report here are
- the 3 green parts I have highlighted
- the general context of where/when it happens ( while exploring a Dungeons, while fighting, while sleeping, etc ... )
- and if the error seems to happen randomly, or if you can easily reproduce it.
DO NOT REPORT ERROR IF:
You are using the Direct2Drive version.
The faulting module IS NOT Oblivion.exe, version 1.2.0.416 ( pay attention to the version number)
If the crash happens when you quit Oblivion.