Acers come with a recovery partition that puts it back to the way you found it when you first switched it on.
Instructions @ http://support.acer.com/acerpanam/desktop/0000/acer/aspiree360/aspiree360faq40.shtml
Once restored, you can create a set of reovey DVD's from the Acer Recovery Manager.
Instructions @ http://support.acer.com/acerpanam/desktop/0000/Acer/AspireE360/AspireE360faq67.shtml
If you would prefer to install a clean version of W7 without all the bloatware Acer installs, you can legally download and then burn an ISO from Microsoft and use your product key @ http://www.mydigitallife.info/official-windows-7-sp1-iso-from-digital-river/
It will activate online, but if you reinstall, you will have to go through the online activation with Microsoft, which shouldn't be an issue.
Be aware, you will need to get the drivers first !