Missing cd dvd drive

After installing the rc Windows 7ultimate version, I noticed that the dvd drive doesn`t show up when I click on the My Computer icon. I haven`t been able to find a driver for it. The model in my laptop is:
Sony (optiarc) dvd-rw ad-7540a. The computer also doesn`t find/show any memory stick/memory card I plug into a usb port. This really is a major pain in the posterior. I am screwed about installing anything if I can`t find on the internet. HeLP.

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