Have lost my cd/writer how to get it back.

well...if u mean that its not being shown....then

This is what you do...

Start the Run Command Prompt

Type in "regedit" without the parrenthesis then click ok

Go to HKEY_LOCAL_MACHINE

Then SYSTEM

Then CURRENT CONTROL SET

Then CONTROL

Then CLASS

Then find {4D36E965-E325-11CE-BFC1-08002BE10318}

The whole thing looks like this:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}

Then delete the upper and lower filters....

RESTART YOUR COMPUTER THEN THERE YA GO!!!! HOPE THIS HELPS