I have a Dell Inspiron 1545 with Windows 7.  About a week ago, the type started randomly  jumping back into previously typed areas of my sentences after every few words.  This happens in word processors and also  emails.  I am not brushing the touchpad.  I have read about others with the same problem, but have seen no satisfactory answer to the problem.  It is VERY annoying.  Anyone have a solution to this problem?