"Computer" screen accesses hard drives slowly

The "computer" screen (the screen which displays all hard drives attached not the monitor) is having issues accessing my hard drives at a normal rate. I just recently re installed Windows 7 Home Premium 64 bit and all of sudden every hard drive attached has an issue with slow loading times. When I say slow loading times I mean that at the top of the computer window it will have a progress bar where the directory list is displayed. Sometimes when i go to a hard drive and than go back it will not displaying anything until the loading bar is complete. The loading bar takes around 10 seconds. 15 seconds max. The progress bar does that when accessing folders within the hard drive, or just going to the main screen that display all of the hard drives. Also it is random. It does not do this constantly.

When I reinstalled windows 7 I changed nothing in terms of the hardware. I do have 21 hard drives and 1 ssd attached to this hard drive (9 internal hdds and 12 external through 5 enclosures). I know this may seem like a lot but I use them for storage and generally access data off of them on a daily basis, AND i never had this issue before re installing. Also I did change the windows search/indexing service to be disabled. I actually am using the blackviper.com "safe" service configuration.

The other thing I notice the computer does is when I go to a hard drive and than I go to back to main display of all the hard drives, I will see only the hard drive icon, name and drive letter. I will NOT see the bar which displays the amount of data being used on the hard drive, nor the text that goes along with this information. I am not sure why it is doing that. It generally takes 10 seconds to get this information back.

I have recently checked every single one of my hard drives attached for S.M.A.R.T testing and everything is fine. All of the hard drives are having this issue. Not just one or two. I do not believe that all of my hard drives decided to fail at the exact same time.

I am not sure what other information I can provide at this time. The thing that caused me to post this is when I tried to play an mp3 on one of the hard drives and VLC (the media player) lagged. It got about 4 seconds in and than all of a sudden it stopped and resumed after a few seconds. I checked and saw it was indeed stuck at 4 seconds into the song. All of these hard drives are completely local. No network drives.

Any information you can provide to fix this issue would be a great help. I have checked a few of the folders and hard drives to make sure are they optimized for general usage and not videos. But I have not checked all of them yet. That was one of the fixes people used when having this issue.

Thank you very much for any help.

thanks for the suggestion. the sata3 driver was installed but i think i uninstall the intel one by mistake. their was no device manager issues so i figured i was fine. its kind of hard to tell whether or not its actually fixed for good since its so random but at this point i think its okay. for now ill mark this as solved. thank you very much!