Does anyone else have access to your machine?
This wasn't done by a third person. This happened after I rebooted my system as I was cleaning up my program list, etc. I don't know if these are related.
Have you tried TestDisk? It can be used to find "lost" partitions.
Try and see if it can find your partition first and get the data out?
Right now, more than getting back the lost data, I want to find the cause for this to prevent it from happening in the future.
Never ever heard of this - partitions just don't delete themselves. When did it go missing? After a system crash, after a reboot?
Why do you not just have at most a C and D partition.. I don't really understand the reason for creating your OS partition and then 2 other data partitions? Why? Your E was clearly in an extended partition as a logical drive.
What does your eventlog say about it?
Does this give any clues?
"A problem has occurred with one or more user-mode drivers and the hosting process has been terminated. This may temporarily interrupt your ability to access the devices."
EDIT: This has something to do with that stupid Samsung Galaxy Tab 2 I have plugged in (educational). Nothing points towards the partition being deleted.