Avast free scans computer every time it boots and slows everything down

[REDACTED]

Hi there, topic title should explain it. It does this so it can get me to upgrade to the paid version by telling me what performance issues my computer has after a lengthy scan. fair enough as you would expect a free version to want you to upgrade but it takes about 10+ minutes to stop choking my system as disk usage goes to 100%. i don't know why it can't just do this once and remember the results in the future, it wouldn't really make any difference.

for reference i am on windows 10

[Asyn]

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

[bob3160]

Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204
If Repair doesn't fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf