using free software to scan external drive for spyware

i normally use free software like adaware to scan for spyware. to scan external hard drive, we need to purchase the license. is there any way to scan external hard drives for spyware using free software?
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-Mystique-Connect With a Mentor Commented:
More sources of freeware for external drives,  including standalone & portable freeware antivirus & other defense tools.

Portable Antivirus  (freeware program) website

Comodo Antivirus has all the functionality of a paid AV without the price  its free forever! No licenses, upgrades, or any hidden costs.
One of the features is
Scan Removable Devices - CD's, DVD's, external drives, USB devices, digital cameras more

cdbesteConnect With a Mentor Commented:
there are two that I use

AVG Free

and SpyBot Search and destroy
phototropicConnect With a Mentor Commented:
Also Malwarebytes' Antimalware:

AVG is only free for domestic use.  If you are using it in a corporate environment (ie. an office) that is a breach of the EULA.
Thanks for the points.

Why a C grade?
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