The most significant risk. Because ultraactivate.dll is not signed by a trusted certificate authority, it can contain anything. Security researchers have identified multiple strains of this file that do more than crack software:
Many users make the mistake of searching Google for "download ultraactivate.dll" to fix the missing file error.
Because this DLL hooks deep into system processes, it can cause conflicts with legitimate Windows updates.
"The program can't start because is missing from your computer." "Ultraactivate.dll not found."