Windows 7: Unable to find CD Rom in windows 7

hi

Can i any one sort this issue i am unable to find cd rom in mycomputer

and i had done some steps like REGEDIT..........HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}



but there not able to detect Upper Filters and Lower filters there it was showing some folders like 0000,0001 and Properties but the properties is not accessing...

Try this (1):
Your CD drive or DVD drive is missing or is not recognized by Windows or other programs
Your CD or DVD drive can't read or write media
The CD drive or the DVD drive does not work as expected on a computer that you upgraded to Windows Vista

Try this(2):
1) Shut down PC.
2) Physically disconnect the CD/DVD Drive.
3) Reboot to Windows with NO DVD drive.
4) Shut down PC.
5) Physically reconnect the CD/DVD Drive.
6) Reboot to Windows with DVD drive.
7) Check Device status.