How Often Should You Scan Windows for Malware?
There is no universal number. Frequency should follow how the PC is used and whether anything is watching in between.
A workable schedule
| Setup | Suggested cadence |
|---|---|
| Real-time protection enabled | One scheduled threat scan per week |
| Free scanner only | A manual threat scan every week or two |
| Shared or family PC | Weekly, plus after new software is installed |
| PC used for work data | Weekly scheduled scan and monthly rootkit-enabled scan |
Always scan after these events
- Installing software from an unfamiliar source
- A browser suddenly changing homepage or search engine
- Clicking a link in a suspicious email or message
- Connecting a USB drive from outside the household
- Any unexplained slowdown, crash or pop-up pattern
Why daily full scans are counterproductive
They consume hours of disk activity, find almost nothing beyond what the first scan found, and train people to ignore the results. A weekly threat scan plus event-driven checks catches far more per minute spent.
Frequently asked questions
Do scheduled scans need the PC to stay awake?
Yes, or the scan is skipped. Pick a time the PC is normally on rather than the middle of the night.
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