# BitDefender does a system scan, but only partially

**URL:** <https://boards.straightdope.com/t/bitdefender-does-a-system-scan-but-only-partially/815091>\
**Category:** Factual Questions\
**Created:** [May 29, 2018, 9:59pm UTC](https://boards.straightdope.com/t/bitdefender-does-a-system-scan-but-only-partially/815091 "2018-05-29T21:59:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Velocity](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/velocity/32/18006_2.png) [@Velocity](https://boards.straightdope.com/u/Velocity)\
**Post date:** [May 29, 2018, 9:59pm UTC](https://boards.straightdope.com/t/bitdefender-does-a-system-scan-but-only-partially/815091/1 "2018-05-29T21:59:39Z")

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I am using BitDefender and it can do system scans to check for viruses, however, once the scan gets to 8% complete, it suddenly says “Scan complete - no threats detected” and ends - as if it couldn’t be bothered to scan the remaining 92%. Wondering what could cause an antivirus to do this?

If I do have a virus, is it capable of sabotaging antivirus software to prevent it from doing its job; kind of a preemptive strike?