Windows Explorer, maybe? Files aren't being saved or copied

jsaxophone

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So, this is something I've absolutely never come across, and a relatively new problem as of this month. It will not occur on a fresh restart, only after the system has been running for a few days. I can't even describe it well enough for a Google search to give me a proper result.

For example 1: I take an SD card out of my camera and into my computer. I open up the source and destination folders and drag-move the files from the SD card to the computer. The system runs the move dialogue, may take a minute, depending on size, the source file is deleted, the destination file shows up in the folder all fine and dandy, successful move.

If I try to open the moved picture, error, (can't recall the error, but basically the file can't be read). I refresh the folder, file is gone. I go back to the source, file is also gone. I run recovery software on the destination, the file was never, ever there, to begin with. It's like it pretended to copy the file, but didn't actually write any information to the disk.

Example 2:
I'm in Firefox. I see an image I want to save to my computer. Save As, it downloads, it shows up in the downloaded tab. I browse to the folder in Windows Explorer, file isn't there. I try to save the image, again, Firefox prompts me that the file already exists. Using Firefox's Save As dialogue, I attempt to open the file. Gives me the same error, (something like File cannot be read).

I've attempted to shut down/restart Comodo Firewall and Bitdefender AV. Doesn't solve the problem. Log off, log back onto Windows. Doesn't solve the problem. Only after a full system restart is the problem resolved.

All hard drives are healthy, and it doesn't appear to be tied to any particular source/destination combo, even a thumb drive. I'm not 100% sure where to even begin to diagnose this problem, but I'm guessing that it lies in explorer.exe.

If it was a hardware problem, shot in the dark, maybe a bad memory stick? I'm only thinking this because it takes a few days of the computer being on for the problem to start, and it can only be solved by a full system restart.

Unfortunately, I have lost a few important files, so far, because of this. I copy a file, go back to using my SD card, and suddenly I don't have the copy and the original has been overwritten beyond recovery.
 

My Computer My Computer

At a glance

Win 7 Ultimate x64
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Win 7 Ultimate x64
bump. No one knows what's causing this?
 

My Computer My Computer

At a glance

Win 7 Ultimate x64
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Win 7 Ultimate x64
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