Ok. Let's see if I can help you out. I run XAMPP on my Windows PC, and also on Linux.
First step is to download the wordpress files. You can do so from here:
http://wordpress.org/download/
Now after you have downloaded the files extract them make sure the output files are at your XAMPP location in the "htdocs" folder. For example if you have XAMPP installed on C:\xampp\ then you will want your new wordpress output folder to be in "c:\xampp\htdocs\wordpress\" or however you wish.
Next before we can install XAMPP we have to make sure of a few things.
First let's make sure Apache and MySQL are running.
To do this open up the XAMPP Control Panel. Make sure that Apache and MySQL both say "running" if they do not then simply click on "Start" from the control panel. (Make sure you have instant messaging programs like Skype disabled as they may use up port 80 which is used by XAMPP).
After you are sure that both Apache and MySQL are running we want to create a database for the blog. So go to
http://localhost/xampp/ and from the left side menu select "phpMyAdmin" (or you can go directly to
http://localhost/phpmyadmin/ in your browser).
From there look for "create a new database" simply enter a database name for example "myblog" and click the create button.
It will now show up on the left hand side of phpMyAdmin.
Now to "install" wordpress.
Go to
http://localhost/wordpress (or whatever the directory you created was).
For example c:\xampp\htdocs\wordpress =
http://localhost/wordpress/.
Because you have not modified the config file wordpress will guide you through the process.
It will ask you for the following information:
Database Name: this is the name of the database you created in phpMyAdmin, my example was "myblog"
User Name: "root" is the default xampp database user.
Password: by default xampp does not use one, leave this blank.
Database Host: set this to localhost if it isn't already.
And leave table prefix as is.
When you are done click submit, then you will be asked to run the install. The rest is setting up the admin pretty easy.
Hope this was helpful, Good luck.