MikTeX does not open directory listings

I've used MikTeX on my old PC Windows 7 Pro 64bit and it worked normally.
Now, I've installed it on my new PC also Windows 7 Pro 64bit, but there is
a problem. The program stops working when I try to save a file under
another name, or to open another file from the program window. There is no
error message; it seems that the program simply cannot read the directory
listings, though otherwise it seems to work normally. Haven't you an idea
on how to fix the problem? Thank you.
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