Quote Originally Posted by elitecover View Post
plz ask me how... i cant do it all game again..
Open the save up in Horizon and rehash/resign with that. If that doesn't work, try moving some of the contents around to a different save (Horizon can do that too). Also, as Jappi suggested, try "unmodding" your save with his tool, as that actually has a decent chance to fix it.

Quote Originally Posted by Apomelasma View Post
...Is it only the steam version and not the pure games for windows live version that gets corrupted? I'd love to hear your current understanding of the problem before getting bored and poking at it myself. Now if this is a problem with just the stream version, that makes the debugging potentially easier. Ex: compare save games and see if steam is doing something funky like adding another checksum/signature to the file so it's specific not just to the windows live account, but the steam account. Just guessing wildly here.
The Steam version of all PC games are different somehow from the Windows Live versions. I don't know how, but they handle the files differently. It has something to do with how the games are formatted so that they mesh with Steam's system.