mikjos: Statements like this are useless to folks like me who just play these games and are not computer wizards. I've recently developed problems with The Witcher, a game I bought a year ago and have played through a few times since with a few minor but not serious issues of it crashing for no reason on occassion. I noticed recently, however, that when I went to save a game or load a saved game that it took longer and longer and the game would sometimes crash when I tried to save a game. Finally, I started the game one evening, went to load a saved game and it crashed. Tried it again and it crashed over and over. Windows spontaneously checked for why it crashed and flashed up on my screen this error message:

"The source file is corrupted"

"You should run the installer's integrity check to verify which files need to be re-downloaded."

I haven't a clue what a "source file" is let alone how it could become corrupted after a year+ of playing the game. I ASSUMED the source file had something to do with what I downloaded from GOG.com. I searched "installer integrity check" in "microsoft help" to see if it would tell me what it meant and it took me to ScanDisk. I then ran scandisk (as "help" prompted me to) to verify I didn't have some corrupted sector of my hard drive or a sector that went dead for some reason and thus caused the problem. My hard drive checked out perfectly fine. I then did a diagnostics on my RAM to make sure all my mempry was intact and it too was fine.

That left me thinking that SOMEHOW the game I'd been playing for a year+ must have had a file or two I downloaded from Gog.com go bad for some unknown reason. I went to GOG.com to see if there was a search engine there or something that could tell me if this mysterious thing called an "installer's integrity check" was some kind of tool or utility I could just click on which would then check my program and see if and where and what file of The Witcher was corrupted and just fix it.

OH IF ONLY I could be so lucky. GOG.COM didn't even have a search engine that I could use to find what an "installer's integrity check" was let alone have any "tool" I could use.

So I tried re-downloading The Witcher, figuring that would patch over and correct any corrupted file. It didn't. The game continued to crash after I tried downloading a saved game. In fact, just clicking on the "Load Save" ibutton caused it to immediiately crash

So I uninstalled The Witcher and as it was about to execute it asked if I wanted to save my saved games. I clicked "yes" then uninstalled and re-downloaded the game a second time. Then I went to launch it and - NOPE still crashed the instant I clicked the "Load Save" button and it gave the same error message.

So I uninstalled it again, this time erasing any and all vestiges of the Wtcher from my computer, including all my saved games, because I figured maybe the corrupted files are in the saved games portion of the Witcher. Then I re-downloaded it a 3rd time, completely fresh ... went through the entire installation process, launched the game, it went through all the preliminary stuff as usual and then I tried to start a new game from the startup/load saved game page. It crashed the second I clicked the "start a new game" button, which was a new problem because prior to that I could at least click on a new game and it would take me inside the game. The problem was, I couldn't save anything in the new game because if I did it would crash the game. I got the same exact error message!

All I wanted was to get this error or corrupt file fixed and there is ZERO help or resources on GOG>com to get help. There is no help file to explain what an "installer's integrity check is" let alone how to use it.

So Gabelvampir, saying things like some big games have .bin files that still have integrity checks in their installers DOESN'T HELP ANYONE. HOW do you get to the installer's integrity check to have it do the check and how do you find out if your game has .bin files (whatever the heck .bin files are)? And then to say "for other installers you can check to see if the signature is intact" What the heck is a signature and how do you check it? Moreover, how would that fix corrupted files, which it is pretty clear I have?

I've scoured the forum for help, even went to the link provided by Snickersnack and it was all written in ancient Sumerian Cunieform to me, assuming I knew what the heck they were talking about. I eventually ended up a GOGWiki where it was supposed to have integrity checks for installers for the games and ... well ... I couldn't find anything even remotely related. If it is there it is about as obvious as a needle in a haystack.

As you can see, I am quite frustrated and I'm asking if there is anyone here that can actually help with this. I've sent a support request to GOg.com but as of yet there has been no response.