Whenever you browse the net your computer has a risk of being attacked by virus or spyware. As soon as these Internet worms take over your PC you start to have their immediate effects. The speed of your computer may start to drop, your monitor screen could turn blue, and your computer may hang. There could be other symptoms, too. The settings of your firewall in the system could have been changed, and sensitive data from your PC could be going out. The attachment with your email could be a virus or a spyware program, and as soon as you try to open the attachment, your computer could be hacked with your personal information sent out to some unscrupulous person.

Virus or worms, as they are sometimes called, may take over your PC and start mass mailing to all the addresses you have in your address book. If you are within a large corporate network, the virus can also initiate a Distributed Denial of Service (DDoS) attack to disrupt your network operation. Several web-based free PC scan utilities are available on the Internet which can detect various kinds of Internet security threats in your computer, including viruses, worms, Trojans, and spyware.

You can have your PC scanned by one of the free PC scan web-based utility found in the internet. The utility can help you to detect any viruses or malware in your computer which is perhaps slowing down your PC. The web-based tool scans for every known Internet threat that may have attacked your system. This may include various types of viruses, spyware, and other malicious software. Free PC scan also detects other files or software which is affecting the operation of your system, and also provides you with website addresses for you to download the missing security patches. After each scan, the utility provides you with a report on the various kinds of threats found in your system.

You must be cautious in choosing free PC scan web tool. You need to choose the one which is authentic and genuine. There are several of these around which are dangerous for your system. Viruses are intentionally fed into your system as you start scanning with some of these tools. At the end of the scan, it comes up with a report which shows a huge quantity of virus that are supposed to have been detected in your computer. There-after, for removal of these viruses they ask you to purchase the anti-virus software from them. The pop-up endlessly comes up no matter what you do.

There are distinct signs when your computer gets attacked by virus or spyware. The system starts to get slow, takes a longer time to boot, an odd tool bar appears with your browser, and if programs like "Msconfig", or REGEDIT do not respond, you can be sure that you have a virus in your system. There are several free pc scan that you can find on the Internet, and one of them can help you detect viruses and spyware in your computer.

The best way to select one of these free PC scan utilities is to go through the user reviews that you can find on the Internet where all the different features of the available tools are discussed. The observations made in there could help you select one of these tools. To avoid permanent damage to your computer system, it is necessary that you are aware of the various Internet threats which can paralyze your PC. Virus may destroy all your data in your hard disk, and malicious software could change your Firewall and browser settings with your personal information going out of your PC to someone on the net. Free PC scan would scan your computer and provide you with a report on the types of viruses and malware found in your system.