It can be a complex question at the best of times.
So many people trying in so many ways to make you pay for the evil intentions of some little programming nerd in a back room whose social contact consists of ordering pizza on the web, & briefly ‘not-looking’ at the delivery guy from the supermarket as he drops off the ordered groceries.
First, best & cheapest method… Don’t be an administrator on your own PC!
What does that mean? When Windows installs it asks for a user name & then installs that user with Administrator privileges – which means that default user can do ANYTHING! So, any piece of code that comes funneling back from the internet into your sacred citadel of data will have the Power of the Administrator to do anything the little backroom boy can think of – delete files, hide itself, re-write the Master Boot Record.
So, create yourself a user-level user; Give it a name & click
Followed by If you use this account to log in & do your daily computing & Internet browsing, you immediately nuke any malware – it can’t actually do anything damaging to your PC.
There is a negative to this – if you want to install software, mostly you will need administrator rights to do so. This can be done by either right-click on a program installation file & choose & enter your Administrator account & password, or choosing that option when a CD or DVD pops up the Run As dialog box.
Note that you can still download software, music & video – also updates for official programs (for example the Windows Media player codecs) will still install, but to run your download programs you will need to Run As or log in as the Administrator account.
Feel free to ask questions or for more explanation. I will cover using protective software & Security Updates in posts to come.