Computers are great machines that ease our digital life, but all of a sudden they can stop working and leave us with many other things unaccomplished. There are several ways to understand why a computer is acting up.

Changes in computer’s behavior may be the result of one or multiple viruses, but there are other possible explanations as well.

If the Computer is Slow: A slow computer may be caused by an upgrade in its operating system, or even an upgrade of a program. Upgrading an operating system version, such as from XP to Windows 7 may require more memory and a program upgrade may take more memory from the computer. Another thing to check is the download folder. If you have downloaded a lot of videos and songs and you have stored them in your pc, over time your computer will slow down.

If the Monitor is Flickering: In this case, you need to first check that the DVI or the VGA connectors are properly and firmly connected to the back of your pc. A loose connector can cause colors fading out in a monitor, tricking users that the monitor life cycle is over. Check first all the connectors in the back of your machine.

Blue Screen of Death: If the computer crashes because of the BSOD, you have to first take a pen and a piece of paper and write down the error code. Google the error code and explore what causes the crash. It may be a virus, a new printer driver that you have installed, a new software that is incompatible or even an hard drive that is announcing its depart.

The Computer Does not Boot: If it does not boot and stays turned off, open first the case and see if the motherboard lights are still on. Check lights near the memory; unplug one memory stick at a time and see if the pc boots with only one memory stick. If it doesn’t check the power supply if it is on. The power supply tester will help you assess if there is still enough juice to turn on your machine. If the machine turns on but it does not load the operating system, there may be a problem in the Master Boot Record (MBR) and in this case you will have to save the data (unless you had backed them up before), and perform a fresh installation of your Windows operating system.

Error Messages on the Screen and Cannot Open Files: This could be a virus- related problem or an error in your hard disk. Check your hard disk for errors right clicking in the computer icon on your desktop.

Pop Up Windows While Browsing: If your Internet experience is annoyed or disrupted by popups, your machine is infected by spyware and needs to be cleaned with a good cleaning product. Try also to install Advanced Pop Up Blocker extension that you can find in the repositories of Chrome and Firefox.