drive disappeared after windows 10 upgrade

http://community.acer.com/t5/Aspire-Desktops/cd-dvd-drive-missing-after-upgrading-to-Windows-10/m-p/455551/highlight/false# 1. try this: Enable or disable CD burning capability in Windows 8 or 7 with this registry hack. Hold the Windows Key, then press “R” to bring up the Run dialog box. Type “regedit“, then press “Enter“. This will open the registry editor. Navigate to the following registry key: HKEY_LOCAL_MACHINE for all users, or HKEY_CURRENT_USER for the currently logged in user. Software Microsoft Window CurrentVersion Policies Explorer Look for a key called “NoCDBurning”. If it does not exist, you can create a new DWORD value under the Explorer folder by performing the following steps: Click “Edit” > “New” > “DWORD Value“. Name it “NoCDBurning” without quotes. Press “Enter” to save. Double-click on “NoCDBurning” and you can set the value to “1” to disable CD burning or set it to “0” to enable it. 2.next To open the Hardware and Devices troubleshooter, follow these steps: Press the Windows logo key + R to open the Run dialog box. Type control in the Run dialog box, then press Enter. In the Search box in Control Panel, type troubleshooter, and then click Troubleshooting. Under the Hardware and Sound item, click Configure a device. If you are prompted to enter an administrator password or provide confirmation, type the password or provide confirmation. If your problem is not solved, try the next resolution. 3. very old but still might work This problem may be caused by two Windows registry entries that have become corrupted. To use Registry Editor to delete the corrupted Registry entries, follow these steps: Press the Windows logo key + R to open the Run dialog box. Type regedit in the Run dialog box, then press Enter. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} In the right pane, click UpperFilters. Note You may also see an UpperFilters.bak registry entry. You do not have to remove that entry. Click UpperFilters only. If you do not see the UpperFilters registry entry, you still might have to remove the LowerFilters registry entry. To do this, go to step 7. On the Edit menu, click Delete. When you are prompted to confirm the deletion, click Yes. In the right pane, click LowerFilters. Note If you do not see the LowerFilters registry entry, go to the next resolution. On the Edit menu, click Delete. When you are prompted to confirm the deletion, click Yes. Exit Registry Editor. Restart the computer.