Inaccessible files in sub folders

Files have all of a sudden become inaccessable in some foders, but not all.

An Example, using both Windows Explorer as well as Total Commander:

C:\ - can see subfolders and files like Autoexec.bat, Config.sys
C:\dell - can see subfolders and files
C:\dell\docs - can see subfolders
C:\dell\docs\manual - folder empty.

If I am in C:\dell\docs and right click on C:\dell\doc\manual and click on Properties it shows the folder size is more than 3 MB. But no files are visible.

Since this effect started all of a sudden, could this be caused by viruses? trojans? Or what do you think causes this phenomenon?
Lennart EricsonAmateurAsked:
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CyrRei88Commented:
Does this problem only appear to happen in the C:\dell folder? or have you seen it anywhere else?

Go to to folder options and select Show Hidden Files & Folders. There might be hidden files in there.
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Subhashish LahaCommented:
Did you tried to run chkdsk in read-mode and check that there is no filesystem corruption?

Also, there could be some permission issue, take ownership of folders where you dont see the files.
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Lennart EricsonAmateurAuthor Commented:
Thanks guys.
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