Use only secure site URLs when performing an online transaction that includes sensitive data.Site addresses that start with https use an encrypted packet to transmit data, so what that means to you the end user is that when you send your credit card information to the site (or anything else that is important to you and that you want to keep hidden) the information that is sent between your computer and the web server is in an encrypted format and without the encryption key (stored on the web server that is hosting the site) the information cannot be seen by anyone that is snooping around the internet looking for information to intercept and steal.
Clear your browser's cache regularlyAfter you have used your internet browser over a couple of days or weeks, you will have amassed quite a bit of temporary internet files that are of no use to you anymore but might provide some insight for a hacker into how a website operates, so its a good idea to get rid of all of them. This will also speed up the performance of your computer as well, so it serves 2 positive purposes. Most browsers can start the cache clearing process with a keyboard shortcut, but if you aren't sure what those are, you can usually find it in the settings area of your browser and more specifically in the privacy settings.
Beware of your pop ups. Take a very close look at the pop ups that you are seeingPop ups can tell you a lot about things that are going on within your computer. A lot of sites will use pop ups as an in your face kind of advertising, but usually you're only going to get one every so often if your machine is running fairly normally. If you are getting several per site that you visit, chances are that something is going on somewhere in your operating system. If this is happening make sure that your antivirus is up to date and that you are running regular scans
Antivirus programs - make sure they auto update and make sure they auto scan every day, as well as monitor programs running in real timeMost current Antivirus programs will do this by accepting the defaults at the time of installation, however, it will serve you well, to ensure through the settings of these applications, that they are setup the right way and doing all of these things. Many viruses will lay dormant until a specific time, so if your system is not monitored in real time, there's a chance that you will not catch something in time before it does damage to the Operating System. Also, do not run multiple Antivirus programs thinking that you are securing your system even further. When this happens, all you have, is 2 applications fighting to be king of the mountain trying to control the security of the computer. It just doesn't work very well, so don't bother, pick one that is highly rated and go with it.
Use common senseI can't stress this one enough, but for some people its as if this is a foreign language. If something looks too good to be true, chances are, IT IS and even though your parents have probably already said that to you more than a few times, it's still true. Consider the source of any offer that you see on the internet. The internet offers anonymity to anyone that is technologically capable of putting up a website, if they aren't forthcoming with all of their policies and information, chances are they're hiding something. Often times just thinking something through a second or third time will save you and your IT guy a lot of trouble.
I hope this was helpful and I hope you aren't doing any of these problematic practices and that you and your IT guy can talk about sports and what happened over the weekend instead of trying to piece together a totally destroyed computer.