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 Is My PC Infected? - how to tell if your computer has a trojan

We have compiled a list of different symptoms that may be present if your computer is infected with a trojan or malware. Please realise that some of these trojan symptoms may occur even when you are not infected with a trojan. The best way to be 100% sure you have a trojan is to run a good anti malware scanner.


- The start page of your web browser has suddenly changed to something else. This is a common trick that is employed especially by spyware to get you to visit a site you would not normally visit.

- When you try to use your normal search engine (like google), you are sent to a new search engine site. This is another trick that spyware and trojans employ to get you to use search engines that have fake results made up of advertisers.

- Your antivirus software keeps turning itself off. Your firewall may also do the same. You may not be alerted about it as your security alert settings in windows may have been changed by the trojan.

- When you try to visit anti virus or security web sites you find they either do not load or you are redirected to a different site. You may also find you cannot visit sites like

- Look at the lights on your modem or the network connection lights on your computer. If they are showing a lot of action and you are currently not using the internet or a local network then this can sometimes indicate an infection.

- Pop up windows start appearing and they are impossible to block. The pop ups may even occur when your computer is not connected to the internet.

- The computer you are using becomes really slow.

- New icons appear for programs you have not installed.

- New virus scanners suddenly appear and start warning you about massive amounts of trojans and malware they have found.

- Your screen may flip upside down or your mouse start moving by itself. You may notice that things are being typed in emails, chats or on your screen that you have not typed. You may feel that computer is being controlled by someone or something else.

- When you install a new program you may get a strange error and the program looks like it has not installed.

- When a website has not been found your computer will redirect you to a strange search engine or site you are not familiar with.

- Your firewall starts giving you a lot of new alerts asking to allow programs or processes you are not familiar with or have not installed.

- Your facebook and or email contacts are receiving messages and emails from you asking for money even though you have not sent any messages or emails.

- Your credit card statement has strange charges for items you did not purchase.

- New tool bars appear in your browser that you cannot remember installing.

- Doing a netstat -a command brings up strange opened ports with connections to strange remote addresses. To do the netstat -a command in windows go to start > run and then type cmd . When the command prompt appears type the netstat -a command and hit enter.

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