After installing and upgrading are the necessary programs to be installed to get a capable installation of Windows to work with.
Avast, Norton, NOD32, Kaspersky …etc., are some names of Antivirus program is a must. I have tried all listed and all are working properly. The important thing is that you have the, not what, but only one of them. Only one.
Check in “Independet Test of AntiVirus Software“
SUPERAntiSpyware, Spybot Search & Destroy, Spyware Terminator, SpywareBlaster…etc.. Do not download any, there are many who claim to be protection for your computer, but is the opposite. SpywareBlaster can be used with the other. It protects against surfing the bad websites, type "blacklist” that prevents you to visit a bad site. I recommend SUPERAntiSpyware. It is available as Freeware that can scan your computer, but I recommend Professional, Real-Time Protection, works very well. Stops many ugly hackers when browsing online.
Spybot and Addware is also capable antispyware program. SpywareBlaster you should install whatever software you use.
Generally seeks a HIPS program to maintain the integrity of the system where it is installed by preventing changes to the system from unauthorized sources. Normally do it by generating a security pop-up warning that asks the user for any change to be approved.