Q: Can I connect my laptop to Apple TV wireleslessly ?

Since you have not told us what type of laptop it is, there's no way to know.

If its a Supported Mac, then Yes.

About AirPlay Mirroring in OS X - Apple Support

Google airparrot

What do you want to stream? As it's a windows machine you'll need Airparrot if it's something like CBN or BBC... However, the ATV has all your iTunes store movie purhcases build in as well as things like Netflix etc...