Vishnu Suktam is dedicated to Bhagvan Srihari Vishnu. It is chanted for attaining success, peace and prosperity. You can download the prayer in Hindi text in pdf in the link given below.
The prayer should be chanted during morning or evening hours.
It is also chanted on auspicious days dedicated to Vishnu especially on Ekadasi.
The file is created by prapatti.com.