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I want a Windows antivirus/antispyware solution that I can use solely for on demand scanning of downloaded files and USB thumb drives.

I don't want it to load anything at startup, save perhaps a right click "Scan This" shell extension.

I definitely don't want it loading any sort of on access resident scanning.


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closed as off-topic by random Apr 23 '14 at 1:06

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up vote 8 down vote accepted

Easy, ClamWin. More free & open source suggestions from yours truly.

Straight off the site:

Please note that ClamWin Free Antivirus does not include an on-access real-time scanner. You need to manually scan a file in order to detect a virus or spyware.


Standalone virus scanner and right-click menu integration to Microsoft Windows Explorer; (context menu)

sounds like what you're looking for!

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Usually I don't mind using open source software but for something like AV that needs continual updates, I'm a bit more sceptical. Do you have any references on how frequently and consistently it gets updated? – LachlanG Jul 26 '09 at 6:35
Clamav is very frequently updated. It is primarily used on many mail servers to scan e-mails. – hayalci Jul 26 '09 at 13:45

Avast comes with 7 "providers":

  • Internet Mail
  • Instant Messaging
  • Network Shield
  • Outlook/Exchange
  • P2P Shield
  • Standard Shield
  • Web Shield

It's configurable so you can stop the ones you're not interested in. You can also customise the providers that are running to be as light weight as you want.

I'm using it in it's standard configuration with 6 providers running (I haven't got Outlook/Exchange running) and I haven't noticed it slowing my machine down in any way.

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