I am stuck on step 4.

Step 4 - Set Back File Permissions
Please make sure the following file permissions are set back correctly:
File / Folder Current Permission Required Permission
includes/global.inc.php n/a n/a
Please ensure the file permission are set correctly to continue.

It tells me that I need to fix the permission which i have windows hosting.

not sure what to do.

NIck

Have your host set the permissions to allow write for that file. It should be set back to read after the shop is installed.