Hi I am trying to view lightroom tutorial videos on my desktop pc running Windows 7 home premium . I have the latetest updates to both Windows and video graphics cards etc but the picture flickers very badly making themun watchable . i can however view them OK on my laptop . As farn asI can see ihave both machines working exactly the same but obviously some thing is wrong with the desktop pc. I can view utube videos ok on it it is just the Adobe utorials that I cannot view .