That's what I get for just skimming. I didn't see that it was already read-only.
My 800x600 problem existed before installing the mod. The mod's readme mentioned it and said they didn't fix it yet, so I assumed everyone else had the same problem.
Since you have saves, you probably shouldn't install it then. It adds a lot of stuff and removes some existing things. I wouldn't want you to load up your game in the middle of a firefight and suddenly find your weapon disappeared from your hands.
I've also got the English version.
7.62!
Yes, the BFX mod (Or.. Blue Sun mod as of lately) is a very good choice. Considering it's pretty much the only mod out there (Hard Life is for the Russian version only, I believe).
Your problem is probably the most famous in the lands of 7.62. Apeiron, the suckers, apparently forgot to make the textures read-only.. and
somehow the game sometimes manages to alter them so that they don't work anymore.
You should install the unofficial patch, which fixes quite a few things and crashes, including that stupid texture bug.
Link
here.
As for savegame corruption: If you have more than.. approximately.. 30 saves in your savegame folder, it will start to corrupt. I've never had corrupted savegames. This is quite ironic, though, considering your best friend in 7.62 is the quicksave key.
If all else fails:
1. Reinstall
2. Apply unofficial patch
3. Either play from here or install the Blue Sun / BFX mod (version 0.9 should be out soon).
4. Post on the Strategy First forums! The place is empty and dead