cd rom drives not able to recognize/read cds in drive
 

I have a regular cdrom and a cdwriter installed on Win2000. Previous
to installing recent version of Nero when I inserted a cd in either
drives I was able to not only view the content of cd but the auto run
was working too. After Nero installation when I insert a cd in either
drive it shows the message "please insert a cd....". But if I have an
audio cd and bring up for example Windows Media Player or Real Audio
first, then I'm able to play the cd.
I have removed the Nero software but still problem exists.
I'm totally frustrated as what the problem might be.
Please advise if you have any idea how I might go about
troubleshooting this problem.
Thanks