IDP.HELU.PSE46 is not a specific virus, but rather a generic detection made by Avast (and other antivirus programs that use the same behavioral protection engine “IDP” = Identity Protection).
This means that Avast detected suspicious behavior in a process or file on your PC. However, it could be malware, which Avast should be able to quarantine or remove, or it could be a false positive (a legitimate program being mistaken for a threat).
What you can do:
1 - Update Avast (both the program and the virus definitions).
2 - Restart your PC in Safe Mode and run a full scan.
If it is indeed a virus and Avast doesn’t remove it, use another complementary tool (such as Kaspersky Virus Removal Tool, ESET Online Scanner, or Malwarebytes).