Will not recognize cd's but plays and records dvd fine

Click start control panel administrive tools computer management device manager scroll to cd/dvd rom drives right click properties then properties again then tick enable cd digital cd audio for this cd rom device also scroll to dvd regions select the no _ for your specific area
If this does not fix the problem you might try
you might have to physically unplug the leads for this cd-rom then plug them back in this should activate the found new hardware wizard
you might have to uninstall then restart your computer then reinstall your DVD/CD or uninstall the driver then reinstall for this device
click start control panel admistrive tools,computer management,device manager scroll down cd dvd rom drives right click you will see options to update driver,roll back driver,or
select properties general troubleshoot, select driver click to reinstall drivers click update driver or uninstall then reinstall
hope this helps