Windows 7 sp1 greek ultimate. Doesn't see all files at once.

Why until now my desktop and netbook works fine and see all files at any folder at once and not
5 - 5 or 10 - 10 files?
Now from everywhere i check(Internal or external or lan discs) show me every folder files NOT AT ONCE.
Why is that happening?

I already check all the hard disks with hdd sentinel and all hard disks is 100 healthy.

So what is happening and what i can do to solve it?

What screen shot.
I already explain what it happened.
For example one folder has 50 files in with the issue i have it shows me these files 5 - 5 or 10 - 10 and i must wait some minutes to see all 50 files and that happening to any hard disk of flash disk or wifi hdd i connect to pc.

No at 1 desktop and 1 netbook.

And i have already check for virus with programs like malware antibytes, nod32, microsoft security essentials, avira and none of them find any virus to any of these two pc's

So what happenning?