Answer by  
                                                                                          ramizq1 (185)
                                                            
                          
                          
                                                           It could either be because of the execution of certain dynamic script/code on the website or because of spyware/malware or adware in your system. Make sure you have a good anti-virus and a spyware detector installed. Get AVG anti-virus, and both Spyware Doctor and Ad-aware which are one of the best anti-spyware programs out there.