I am now using Windows 7 and Google Chrome. Since one or two months ago, the performance of my PC has been very poor. Pictures do not show up in certain web-sites and whenever I watch certain shows on-line, the video page is totally blank (i.e. no visual images) although the audio is okay. On top of that, the screen freezes every now and then. Just now, due to a frozen screen (but with the audio still on), I tried to close that window of that page by doing Alt + F4 and the screen crashed. After re-booting up my PC again, I have got the message, which says, "The program can't start because MSVCR80.dll is missing from your computer. I am not a technical expert and do not understand what that means. Can someone help me please? Many thanks!