Usb drives are not shown in "My Computer"

Just as it sounds, my computer recognizes that I plug in a usb drive, but it is not shown in "My Computer."
I can still access the drive if I navigate to it through the address bar, and at the moment I just have a shortcut directly to the drive letter.
I've tried reinstalling the device and assigning drive letters but it hasn't worked. I've tried plugging in my external HDD, my flash drive, and my phone but none of them show up in "My Computer."

This isn't crippling to my computer but it is very inconvenient.
Any help would be great.

-Thanks
-7

Thats the thing, I've already done that.
It still doesn't show up in My Computer, the only drive letters I have used are C: and D:, and I assigned P: to my phone.

I thought I did but apparently I don't, the only system restore I have is like 20 minutes ago...

Oh and I changed it to E:, no change...

Since you can access the drive, backup the data on it. Then format the drive. If this is a thumb drive, you can use the HP tool to format.

I already reinstalled the driver. There is one thing with an error (PCI FLASH memory)...which I was meaning to ask about...
Still nothing.

I was given this computer, never had the CD. I tried the program but I get this error: I restarted the program, I restarted the computer, I ran as administrator...