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There are 2 missing drivers each when installing windows vista and windows 7 on an ACER EXTENSA 5520 laptop. The missing drivers for windows 7 are mass storage controller and unknown device. The correct drivers are Texas instruments flash media reader and Infra red fast port. Click here for flash reader and here for infra red driver. For windows vista the mass storage controller is the same as windows 7 and the other device is a video controller. Click here to download the video controller for windows vista.

Don't forget the correct power supply for this laptop is 19V 2.37A 5.5mm 2mm