I recommend only installing a virus guard, security suits can sometimes be a real pain to deal with. My favorite is ESET NOD32. Here is a link to
NOD32 virus guard installer (directly from the developer’s site; so you can trust the installer 100%), use
this site for keys. Guess everyone has their own favorite. However, according to most benchmarks NOD32 and Kaspersky are the two best VGs out there.
P.S: You might have to use a key to login to ESET site to download the VG.