plug n play not working after upgrading windows

i had been using windows xp 2007 and i upgraded it. now i am not being able to use my pen drive. when i insert the USB drive the "new hardware found" message appears on the system tray but when i open my computer i can't find it under the "devices with removable storage" .
wud be glad if my query replied .

go into disk management
Control Panel/Administrative Tools/Computer Management/Disk Management

and if the drive is there activate it if that doesent work give it a different drive letter

What exactly do you mean by "XP 2007" and how did you "upgrade it"?

Is the drive new or does it contain data?

If new did you format it?

if that does not work go to administrative tools From there select "services"
It will load a list of all the services running, or not, on your PC.
Look for the one named "Universal Plug And Play Device Host" if it says automatic, leave it be. If it says "manual" or "disabled", double click it and from that menu set it to automatic, then select "start." It will start the process.
also look for "plug and play" should be automatic
"SSDP discovery service" should be manual
"windows media player network service" should be manual

one of the two posts should help