b) Understand the refund/return policy before you make your purchase.
C) Buy from a local store that you already know or a national chain with an established reputation.
b)What files are installed and what other changes are made on your system when you install and run the program? Again, to do this test, you may have to ask the author/intruder how their program changes your system. Consider the source.
c) Who is the author? (Can you use e-mail, telephone, letter, or some other means to contact them?) Once you get this information, use it to try to contact them to verify that the contact information works. Your interactions with them may give you more clues about the program and its potential effects on your computer and you.
d) Who else has used the program? This focuses on what aspects can you learn from him or her. Try some Internet searches using your web browser. Somebody has probably used this program before you, so learn what you can before you install it.