Heur files detected even when heuristic is off

I did context menu scanning while heuristic was off, and in results it showed 3-4 Heur files.

  1. CPU Athlon 64 X2 4600+
  2. Windows XP pro, service pack 3, 32 bit
  3. CIS 3.8.64263.468
  4. Antivirus - default settings
  5. Firewall - custom policy mode
  6. Defense+ - clean PC mode
  7. Administrator account