COMPUTER PROBLEMS DUE TO INTERNET SURFING

TKS FOR YOUR ANSWER. I HAVE EVERYTHING INSTALLED ON MY COMPUTER THROUGH A COMPLETE MCAFEE SECURITY SYSTEM, SO THE PROBLEM IS SOMEWHERE ELSE. ANYWAY, MCAFEE ALWAYS SEND A POP-UP TO INFORM ABOUT THE PROBLEM AND, IF IT'S A VIRUS OR UNWANTED PROGRAM, IT AUTOMATICALLY REMOVES THEM, BUT WHEN IT'S A CHANGE IN THE COMPUTER SYSTEM, IT ASKS ME IF I WANT TO ALLOW IT. I WOULD LIKE TO KNOW IF THIS HAPPENED SO SOMEONE ELSE, I'M NOT TALKING ABOUT VIRUSES ETC., BUT ABOUT A POSSIBLE CHANGE IN THE SYSTEM.

TKS FOR ANSWER. NO MY COMPUTER IS OK. THE ANTI-VIRUS PROGRAM JUST SCANNED IT TODAY AND DID NOT FIND ANY PROBLEM. AS I SAID, I KNOW THAT SOME SITES INSTALL UNWANTED PROGRAMS IN YOUR COMPUTER WITHOUT YOU KNOWING ANYTHING ABOUT IT AND SOMETIMES THEY EVEN TRY TO MAKE SOME CHANGES IN YOUR SYSTEM. I KNOW BECAUSE A FEW MONTHS AGO, AFTER SUBSCRIBING TO TWO SURVEY SITES, I HAD PROBLEMS AND THEN I DISCOVERED THEY HAD INSTALLED SOME SOFTWARE WITHOUT SAYING ANYTHING. I THINK THIS IS REALLY AWFUL. NO SITE SHOULD DO ANYTHING TO YOUR COMPUTER WITHOUT BEING AUTHORISED BY YOU, EVEN IF IT'S JUST SOME SIMPLE SOFTWARE CHECKING THE SITES YOUR VISIT. THERE SHOULD BE A LAW AGAINST THIS KIND OF THING AND WE SHOULD BE ABLE TO POST A MESSAGE SOMETHERE ON THE INTERNET WITH THE NAME OF THE SITE THAT DID SUCH A THING.