Laptop losing drivers, any ideas?

[Yucca]

I have a toshiba laptop, that I brought about a year ago and latley it has been losing its graphics card drivers. This only seems to happen when I play DVDs. I have tried re-installing the drivers from the C.D provided and also from the ATI website.

Its not the DVD as I have tried others. I do not think its the software either as I have never had problems in the first year and I have tried reinstalling that too.