Usb Pen Drive Invisible

I am not able to access my usb pen drive or indeed my usb mp3 player through 'My Computer'.

I have windows XP sp 2 installed.The problem seems to have arisen since I upgraded my motherboard/CPU from a Asus P3V4X/Pentium III 800 mhz Slot 1 to an Asrock AM2NF3VSTA/Athlon 64 3200+. I did a repair windows install. I have installed the latest m/b usb drivers and flashed the bios to the latest version.

Whenever I plug my pen drive, it correctly shows "safely remove" icon in the taskbar but My Computer does not show USB drive letter. Other usb devices (Canon camera and Epson scanner) work ok through their own software.

If I want to access the Pen drive I can do a work around through admin tools - disk management. Here I can see the drive and assign a letter to it and access it from within this program. The drive remains invisible in My Computer.

Does anyone know how can I solve this problem ? thanks, Neddy

 

What drive letters are currently in use by the system?

 

A: Is my Floppy Drive
C: My One and only hard drive
D: DVD Rom Drive
E: DVD Writer

I expect to see the USB Drive on F: which where it used to appear.

 

Yes, I would expect it to take the F: drive as well, but let's do some investigations:

1. Right-click 'My Computer' and select 'Manage'
2. On the 'Computer Management' window, click 'Disk Management'
3. Make sure the window is maximized, and take a screenshot
4. Post the screenshot here.

 

Same porblem happend to me a few weeks ago, it was showing up in the manager but no disk letter and I was unable to assign a letter or access the drive.. only thing I could do was format

 

Here is a screenshot of my disc management window. No drive letter is assigned. If I right click I can assign a letter (any free letter works) Then I can view the files by right clicking and selecting 'open' (but does not work by selecting 'explore'.