H520s Windows 8 DVD-ROM disabled and error 19 - registry corrupt Help please!

Hi all and hoping for help with H520s, 64bit  OS Windows 8. Error message showing  problem with DVD-RAM Mat**bleep**a SW820; this is disabled in the device manager, and I can't use the DVD drive as a result. (yellow triangle)
Have tried windows fix utility on pc ; drivers are up to date. Have disabled, enabled etc. But it's still error 19
This was working perfectly until a couple of days ago when Microsoft ran a mega load of updates, including critical windows 8 updates. Am wondering if there's some conflict?
Have searched the Lenovo solution centre for up to date drivers for the dvd-RW but there aren't any. Don't really want to uninstall the DVD-ROM drive and attempt reinstall unless can definitely reinstall and can't find anything that reassures me I wil be able to do so.
Wondering if Is this similar to another issue on Toshiba pcs where it seems, according to various searches,  it was a corrupted registry entry due to conflicts with pre installed pc rescue type utilities?
I'm no IT expert and the idea of registry fiddling is not reassuring.

hi teapot,
Welcome to Lenovo Community Forums!
You can try Micorsoft's automated ix it tool about the same issue.
Check this Link
http://support.microsoft.com/kb/314060
try that and it should work,
Hope this helps,
Cheers!
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