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#31
Are you following Clean Reinstall - Factory OEM Windows 7?
It explains exactly how drivers are handled in Win7, as well as everything else you need to know to get and keep a perfect install.
Most drivers will be provided during install and after you get online, enable Automatically deliver drivers via Windows Update (Step 3)
then run all rounds of Important and Optional Windows Updates, with reboots, until there are no more.
Any drivers still missing after all Updates are done can be found on the Acer Support Downloads webpage for your model. If there's no Win 7 drivers try Vista, google the Device make and model for a Win7 driver, or ask back here for it.