I would suggest installing it manually (I believe quite a few people have problems using the web-host installation scrips such as fantastico - I don't think I've ever used it, I always preferred just uploading the files manually).
It's very easy to do a manual installation:
1./ Create a new DB via CPanel. You'll also need to create a user account for the new DB (and also you'll need to associate that username account with your new DB - there's a drop-down list in CPanel for this locate within the same place that you created the new user account. Select the DB & then select the user account to link it to & press save)
2./ Go to your website root folder on your server. Upload the WP core zip file into your (empty - apart from anything the web-host may have put in there) root folder & unzip it by pressing "extract" in the CPanel toolbar which should be located at the top of the page (note: delete the zip file once that you're sure it's installed OK & you no longer need them, as it's not good to leave them and they use up space)
3./ open up wp-sample.php & add in the details of:
- your new database name
- your new database user
- your new password for that database
then go down to the bit that has a link to get your "Authentication Unique Keys and Salts". Copy the link and open up that link in a new web browser tab, and then copy & paste each of the 8 keys one-by-one into your wp-config-sample.php
Press "save" and close wp-config-sample.php
- Rename the wp-config-sample.php file name (remove the "-sample" bit & re-save)
That's it! your site should now be ready for you to log into & start having muchos fun!