They all look OK to delete, far as I can tell. Only delete those that are bolded, as indicated especially where you have expanded the entry. Ie: don't delete the parent entry, just the bolded one under it . So, for example, you would not delete "software" nor "microsoft" (etc) but would delete, under "ARP Cache" the one marked "SymSetup...". I can't tell what is under it, as the entry isn't expanded, but if it related to anything else with a "Sym" "Symantec" or "NIS' or "Norton" in it, you are probably OK to zap it.