Avast Free, very high CPU usage 50%

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I have been using Avast since many many years with Windows 7 home premium
After de latest program update Avast started to create a very high CPU usage 50 %, which I never experienced before.

I uninstalled Avast, subesquently the PC would not boot anymore
I reinstalled Windows 7 and reinstalled avast free again very high cpu usage.

Please advise as you understand I am hesitante to uninstalle Avast again.

Kind regards

Robert

[Asyn]

- Which Avast..? (Free/Pro/IS/Premier)
- Which version..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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 Which Avast..? (Free/Pro/IS/Premier)      FREE
- Which version..?  latest version 151119-0
- OS..? (32/64 Bit..? - which SP/Build..?)   64 
- Other security related software installed..?  no
- Which AV(s) did you use before Avast..? before the reinstall i used bitdefender for a short time

but I did a clean reinstall of windows 7 now

[Asyn]

- Which version..?  latest version 151119-0

That's the VPS build not the version.

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I found the cause, in Tools the cleanup tool causes the CPU usage, I switched it to off and the usage is back to 0

[Asyn]

OK, thanks for the feedback.