There are numbers of different signs which show that the computer is infected with malware. The PC starts slow down its performance and takes minutes in loading programs and webpages on the Internet. Also, after being infected it displays blue screens or pop-up ads and redirects the user to the misleading websites. However, all these signals were in the old times of malware.

Now malware is much more sophisticated and the days of saying that ‘you-can-tell’ when the computer has been infected may be long gone in the near future. The hackers are becoming more experienced and now malware is created not only for crashing the machines. The rogue security applications nowadays do not affect computer work and the users have no idea about the infections which are planted in their PC system. Hackers get the ability to log the keystrokes and steal any password or credit-card number or can link the infected computer with others to send out spam. To sum up, having anti-virus software installed to the PC is hugely advisable because the fact is that hackers are becoming better and better.