When i turn the computer on it says i need to install windows. So if i buy windows 7 insallation disk will that fix it?
What exactly did you do, what happened? No need to spend at least $100 on a Windows 7 disk when you may already have it. Should have had a recovery partition with Windows on the system when you bought it, and a way to make a backup DVD set to re-install. If you contact ACER they may be able to send you a restore disk set for a lot cheaper than a new Windows 7 purchase.