Reinstalling the operating system is a little drastic just to reinstall the keyboard driver. The keyboard driver is a generic one and it likely won't fix your issue. However if you want to do this just go to Start then Run and type in devmgmt.msc. This will open Device Manager and from there you can right click the keyboard, uninstall and reboot to reinstall. Alternately you can follow these instructions from MS to update your keyboard driver
although I don't see there being an update.
You can however reinstall the Synaptics Touchpad Driver which is available from Acer. This driver contains components for the keyboard according to the release notes in the .zip file. I assume you know how to find it as you've looked for the keyboard driver. If you do this you remove the Synaptics Driver from add/remove programs, reboot and install what you've downloaded. I'm not sure what functionality you'll have as far as moving the cursor goes when you go to reinstall Synaptics so to be safe use an external mouse and make sure its working before you try this.
Having said all that, what I would do is physically remove the keyboard and make sure it is clean underneath. This could possibly be your issue. I was unable to find a service manual for that netbook so you'll have to wing it.
A couple of notes:
If the touchpad is not working properly, the touchpad may be disabled. To enable the touchpad, press and hold the Function (Fn) key and tap the F7 key on the keyboard once.
That may come in handy if you do reinstall the Synaptics driver. You can also try this to see what will happen when you uninstall Synaptics.
Press Ctrl + Alt + Del
Click Start Task Manager.
Under the Applications tab, click New Task
Click the Browse.
Double-click Acer (C:).
Double-click the Acer folder
You may locate the eRecovery there although considering the fact that you were supplied with the recovery cd and the fact you have an 8 or 16GB SSD (depending on the model) I doubt you will have a recovery partition due to space limitations. Using Alt + F10 activates the recovery program and it in turn draws from the recovery partition when not using the supplied cd. If you were to attach an external drive and insert the recovery cd using Alt + F10 would start the recovery process. If you want to check for that partition go to Start then run and type in compmgmt.msc. On the left go to Disk Management. The recovery partition will show up as a partition in Disk 0.
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