There might be a case where your computer behaves strangely. You might wonder why computer is not working normally. It might be a simple case of your computer infected with viruses.

Look for the following symptoms which shows your computer is infected with viruses.

Your system has become very slow and hangs frequently. This is my personal experience. One of our users complained frequently that his system has become very slow. Since he was running very high CPU cycle application, I though it’s happening because of that only. Then the time came he refuses to work on that system and I ran anti virus program for the first time on that system.

Application works very strangely. For example Firefox doesn’t start up and gives error while starting. W32.USBWorm stops Firefox from running and gives error “I DNT HATE MOZILLA BUT USE IE OR ELSE…” .

Software programs crashes frequently.

Anti virus program doesn’t start at all. So this is also a one symptom in which virus disabled the anti virus software. You have anti virus software installed on your compute that doesn’t mean that you are 100% secured. But with anti virus software you are more secure than without.

Disk becomes unaccessible. Some viruses are there which can fill up all remaining space on the disk.

Different types of characters appear in the menu and also while writing in the note pad or word.

Dialog box come up while opening any drive ( double click on drive ) which asks for the application to select for opening that drive.

You notice that some programs are missing which you didn’t uninstall.

Your friends and relatives complains about the mails and instant messages which actually you have never send them.

IE home page changes to some page which you don’t want.

Well there are many other symptoms also which shows that your computer might be at risk. Each computer virus has it’s own functionality. Simple rule to check whether computer is infected with virus or not is that your computer doesn’t work as you want instead of having good hardware.

If you find any of above symptoms then you should consider installing anti virus software. If you already have anti virus program installed then you should consider trying other one.