I've had this problem for a while, so I've always created multiple saves. Basically, for a reason I can't discern, some save files become broken and immediately crash Morrowind when I load them. So I've always had two save files for my character. Every time I quicksave I also make a hard save, so that if the quicksave happens to crash when I load up my game I can load from the hard save instead (or vice versa).

Trouble is, this time both the quicksave and the hard save are broken. The hard save loads the game up, and then crashes about 1 second after I'm able to move. The quicksave crashes once the loading bar is complete but before I can see anything. The last autosave works, but was made a heck of a long time ago. And even if I do resort to using it, I know I will just run into this issue again in the future - so I'd really like to get to the bottom of it.

I have run Wrye Mash's save repair and it reports no problems. I do get this message when I start Morrowind though: "Could not inject MWSE into Morrowind: Could not get Morrowind process: Access is denied." Though I've never noticed any issues occur as a result (unless this save issue is related).

Any ideas? It's infuriating to think of all the time I've invested, and suddenly this character becoming unusable.

Many thanks for reading

If you have MWSE, this could be a mod problem, and you might post in the Mods forum.
If you don't have the MCP (Morrowind Code Patch by Hrnchamd) applied to your Morrowind.exe, you should do that.
I would try disabling external programs (MGE, MWE, MWSE, ...) or anything else like that. If you have any mods, it would be good if you could copy/paste your load order. If there's anything in your Warnings.txt, you should copy/paste the contents here.
If you do have mods, the binary search method (turn off half your mods, test, then half again), is often good for finding buggy or conflicting mods.