how to install xampp on 64 bit window machine?

[clairenova]

I am trying to install xampp to a laptop with 64-bit window 7 system, but cannot find the right file to download.

Can a 64 bit machine run xampp?

Thank you.

[Altrea]

Can a 64 bit machine run xampp?

XAMPP is compiled by a x86 32bit compiler but your 64bit os cann execute 32bit applications as well. So that is not a problem.
Just be sure that you have installed the required VC++ runtime in x86

[clairenova]

It's installed and works! thank you.

What's the difference of those 3 versions? I have downloaded 5.6.19, will the more updated (7.0.4) the better? basically I will run drupal 7 and 8.

[Altrea]

The difference is the included php version.
There is a XAMPP version available for each of the maintained php version.

Which version to choose depends on the requirements of the webapplicaton you want to use. There are still many scripts which don't support the newest major php version.