If you'll read through Clean Reinstall - Factory OEM Windows 7
it explains how drivers are handled best in Win7 which is different than XP.
It also explains that leaving out the preinstalled factory crapware and duplicate utilities gives better performance by the OS.
However if you'd like to try running Acer factory recovery: Acer Support: Recovery media and Restoring a system to factory load.
Make your Recovery disks first so you have a backup method.
Afterwards you can Clean Up Factory Bloatware
. In fact running those steps now may help solve some of the performance issues you're having. If not you can also try these Troubleshooting Steps for Windows 7