Windows 7 not showing all Thumbnails + green bar

The thumbnails I was referring to were the images in your screen shot of drive L:.

If you're getting the green bar on your C: drive with those other drives disconnected, it may be a power supply issue. The only other suggestion I could make is to try a SATA port different than the one you're using for the C: drive. I don't have a drive larger than 2 TB so I can't say how long it takes to read a 4 TB drive. It shouldn't be excessive for SATA. The L: drive green bar may be related to the USB connection difference.

Got to go do some personal stuff so I won't be back until later or until tomorrow.

If you want to re-install Windows, go for it. However, I would back up my personal files first, if you're doing a full install or simply do a Windows repair.
 

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Windows 7 Pro SP1 64 bit8 GB
Computer type
Laptop
Computer Manufacturer/Model Number
Dell M6500 Precision Work Station
OS
Windows 7 Pro SP1 64 bit
Memory
8 GB
Screen Resolution
1920x
Internet Speed
30 Mbps
Antivirus
Norton Security
Browser
IE 11
No I didn't go reinstall. I am missing a few cd's. I can't find my MB cd. I had it built in 2013. Who knows where they are.
 

My Computer My Computer

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Windows 7 Home Premium 64 bitIntel Core i5 760DD3 8MGNvidia GeForce GTX 460 1MB
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Home Premium 64 bit
CPU
Intel Core i5 760
Motherboard
Asus P7H55M Pro
Memory
DD3 8MG
Graphics Card(s)
Nvidia GeForce GTX 460 1MB
Hard Drives
2 X 4TB
Antivirus
Avast
Browser
Chrome
How big are the image files?

If you have a stack of multi-megapixel images, it will take a long time to generate thumbnails.

I have a folder with ~2000, 1920x1080 wallpaper images that are 2 MB - 3MB in size.
It takes Windows a couple of minutes to generate thumbnails for them.
 

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W7 Ultimate SP1, LM19.2 MATE, W10 Home 1703, ...AMD Phenom II x6 1100T, 3.3 GHz12GB DDR3 1333 G-Skill (4GB x 2), G-Skill (2G...NVIDIA GeForce GTX 660
Computer type
PC/Desktop
Computer Manufacturer/Model Number
n/a
OS
W7 Ultimate SP1, LM19.2 MATE, W10 Home 1703, W10 Pro 1703 VM, #All 64 bit
CPU
AMD Phenom II x6 1100T, 3.3 GHz
Motherboard
ASUS M4A88T-M/USB3 (AM3)
Memory
12GB DDR3 1333 G-Skill (4GB x 2), G-Skill (2GB x 2)
Graphics Card(s)
NVIDIA GeForce GTX 660
Sound Card
Realtek?
Monitor(s) Displays
Samsung S23B350
Screen Resolution
1920x1080
Hard Drives
WD Green 2TB (SATA), WD Green 3TB (SATA), WD Blue 4TB (SATA), WD Blue 6TB (SATA)
PSU
Cooler Master
Case
Antec GX300 Tower
Cooling
3x Antec TRICOOL 120mm Fans
Mouse
Wired Optical
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DSL
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Avast
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Pale Moon (64 bit)
Other Info
2018-12-27 Upgraded HDDs
2015-12-10 Upgraded case, graphics card, storage
2015-08-15 Upgraded motherboard & RAM
2015-07-15 Upgraded LM17.1 to LM17.2
No I didn't go reinstall. I am missing a few cd's. I can't find my MB cd. I had it built in 2013. Who knows where they are.

Does MB mean motherboard? Don't know why you would need that for a Windows reinstallation or repair. I assume you can get the mobo drivers from ASUS.

I like the response from lehnerus2000.
 

My Computer My Computer

At a glance

Windows 7 Pro SP1 64 bit8 GB
Computer type
Laptop
Computer Manufacturer/Model Number
Dell M6500 Precision Work Station
OS
Windows 7 Pro SP1 64 bit
Memory
8 GB
Screen Resolution
1920x
Internet Speed
30 Mbps
Antivirus
Norton Security
Browser
IE 11
Anywhere from 3MB to 24MB. Just photos I take. But it's not only those. Even if I download a 13kb picture, I can't see it.
It goes for any file, it does not have to be a picture. Even the folders disappear, but the name stays there.
 

My Computer My Computer

At a glance

Windows 7 Home Premium 64 bitIntel Core i5 760DD3 8MGNvidia GeForce GTX 460 1MB
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Home Premium 64 bit
CPU
Intel Core i5 760
Motherboard
Asus P7H55M Pro
Memory
DD3 8MG
Graphics Card(s)
Nvidia GeForce GTX 460 1MB
Hard Drives
2 X 4TB
Antivirus
Avast
Browser
Chrome
Yes, MB is the motherboard. I didn't know I can download them......... I have not been thinking straight for the past month.
 

My Computer My Computer

At a glance

Windows 7 Home Premium 64 bitIntel Core i5 760DD3 8MGNvidia GeForce GTX 460 1MB
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Home Premium 64 bit
CPU
Intel Core i5 760
Motherboard
Asus P7H55M Pro
Memory
DD3 8MG
Graphics Card(s)
Nvidia GeForce GTX 460 1MB
Hard Drives
2 X 4TB
Antivirus
Avast
Browser
Chrome
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