CD/DVD drive is not detectable

If the CD drive is not listed from "My Computer", pls click this link first before doing the below steps.
There is a CD that can upgrade your current operating system to a new OS, aside from the usual genuine Windows CD that would cost more than the upgrade version. Unfortunately, there are times that when you upgrade it, suddenly the CD/DVD drive is not recognizable anymore. Going into registry of the computer is very critical coz 1 data entry change will make the computer non-working. Carefully follow the steps below.

I. DELETING UPPER FILTER
1. Click Start, type regedit at Run
2. In Registry Editor, expand My Computer, then expand HKEY_LOCAL_MACHINE
3. Expand SYSTEM, then CurrentControlSet
4. Expand Control, then Class
5. Click 4D36E965-E325-11CE-BFC1-08002BE10318
6. On the right, click UpperFilters
7. On the Edit Menu, click Delete

II. DELETING LOWER FILTER
1. Perform Steps 1-5 above
6. On the right pane, click LowerFilters
7. On the Edit Menu, click Delete

Exit Registry and restart the computer. This is mandatory for values to take effect.

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