Even if the reader has essential security applications (anti-virus, firewall, etc.), it is normal for certain malicious code can enter your computer (spyware, rootkits, etc.) without the reader noticing.
To remove all the infections on your computer can use the Norman Malware Cleaner.
Remove all computer infections
To download the program please go to the following link: Norman Malware Cleaner. (if the download does not start click here).
The program requires no installation, which can be a big help in computers with a high degree of infection.
Norman Malware Cleaner analyzes all files on your computer for malicious code, by their removal.
Point out that the entire operation must be done in safe mode for greater efficiency (see how to get in safe mode here).