Hello, been awhile since I have been on.
Running Windows 8.1  , HP computer with 1 tet drive and 8 gig ram.
Security on board is Norton Internet Security for 2015
Malwarbytes shareware program.
 This problem when it pops up which is quite often Norton blocks it everytime but I want to get rid of it.  I have scanned with  norton internet security and Malwarbytes,Spyhunter and tried Norton,s Power Erasure.Also ran superantispyware ,  No luck.
  The main one is  sape.Heur.51dp.
Others I have seen but have not seen in awhile are.    sape.sbWatchman.1,  videodownloadersdk.exe and Windisk-Windows-malavida.exe.
  It is strange that my Norton program does not see any of these when I run a full scan. But if any of them pops up, Norton blocks them ?
 One thing about computers, you never get out of the learning curve.    We,ll there you go folks, any idea,s ???  Thanks you if you can help.  Later, Techone