I've recently dl'd (sweepers and updaters)
Hope you didn't use more than one of those. It doesn't happen often but is does happen where one of those driver cleaning programs can and do remove more than they do, which usually results in a repair install of Windows at best, and a complete re-install of Windows at worst to repair the damage. That can be avoided by either,
A. Having a good backup in place to revert to if it happens, or hope that System Restore will get it back.
B. Not using driver cleaner programs of any kind, unless prepared to deal with the risks.
If you haven't yet try running System restore to before you tried installing the latest driver and when things worked as they should. If that works and gets things back, might be a good idea to then leave well enough alone until you confirm with Acer whether it does use switchable graphics or not. If it does then you are stuck with using whatever updates Acer puts out for it.
As for most if not all driver updating types of programs, most are comfort-ware at best, and some can wreck havoc as well (older drivers, incompatible, etc). Do yourself a favor and check in Programs and Features for the updater program and once found, uninstall it.