DVD drive can't read DVD on Vista

Hi. My laptop couldn't read DVD anymore, after one fine day. It was
working fine maybe 2 months back, now it can't read any DVD at all, but
it's able to read CDs.
I just can't figure out why. Hope someone is able to help :)
Thanks in advance.

Matshita DVD+-RW UJ857G ATA Device
Windows Vista Home Premium

is there any other details i need to give? :confused:

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