Is this possible to Windows (7) crash whole directory of WAV files? Every file WAV in that dir bits a loud sound (crash) wich repeats average 1/2 sec with high sound freq. Mp3 files are Ok and other dirs with Wav are Ok. These files was Ok after Audacity saved them (I’m shure). I opened them after 2 years and discovered above crash.
I attach a short sample.
“Perfect” bursts of white frequency noise 
It is very unlikely that WAV files have changed while just sitting on your hard drive.
If you play the affected files in some other program.is the problem still there (with the noise burst in exactly the same places)? If so then I suspect that the recordings were damaged at the time that you made them.
Do other WAV files load and play OK in Audacity and are you able to create new WAV files in Audacity that work OK? If so, then it would seem that whatever the problem was, it is no longer a problem (but unfortunately you have probably lost those old recordings).
I think so too. They might been damaged only by a program (not filesystem) because they are steel readable as files.
It seems like they were damaged by program, which loads whole directory. One I can think about is WMP 
which creates various problems with its “officiousness” (loads “libraries”, creates titles on playlist by metadata instead of filenames, etc).
If you play the affected files in some other program.is the problem still there (with the noise burst in exactly the same places)? If so then I suspect that the recordings were damaged at the time that you made them.
Yes, “bursts” are always in the same places. But I’m sure that Audacity wrote files Ok because after I had created files, I recorded audio CD from them and this CD sounds Ok until now. It is possible that files were loaded by WMP which kept them as library and who knows what this sheet did with it.
Do other WAV files load and play OK in Audacity and are you able to create new WAV files in Audacity that work OK? If so, then it would seem that whatever the problem was, it is no longer a problem (but unfortunately you have probably lost those old recordings).
Yes, I can do it Ok.
Thanks for post.