You can download Power BI from the URL http://www.powerbi.com/dashboards/downloads/ and you can follow the simple steps as given below:
Step 1: Start Screen
Steps 2: Agree to software license terms
Step 3: Installation path
Step 4: Create a desktop shortcut
Evaluation of the tool:
Step 1: Get Data ( I have downloaded the data from Event viewer in the CSV format and used the data source in this scenario)
Step 2: Select the fields from the right hand side Fields
Step 3: I was putting across a Table and a Pie Chart.
Some problems I faced during data load with PowerBI, takes time to load the data from excel sheet. Otherwise still I believe this is a promising tool. I just tried to export my event viewer tool to and just played around to get the following output.
The drill down capability is filtering the data table according to the chart events is very nice. But still looking to play around with it to understand more.