searching for a free video screen capture tool for Windows 8.1

I am looking for a simple, free (or cheap) video screen capture tool for Windows 8.1.  Primary use would be to show/share process steps to others and to capture and show glitches users experience to their IT support staff.

I have found several candidates but many reviews complain they are full of malware or create other problems.  Would obviously want a clean product.

Output should allow production of small files and low band width requirements for easy transmission and should be easily viewable by recipients with iphones and androids without special software.  It would also be helpful to record microphone input while capturing video of screen.

Any suggestions?

Thank you.
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Thomas Zucker-ScharffSolution GuideCommented:
I know you asked for free, but camtasia Studio is, IMHO, the best piece of software out there for this purpose.  But if you insist on free, have you tried CamStudio?

Here are some pages I found with a quick google search:
Youtube video of getting camstudio running on windows 8.1:
camstudio alternative:

Also you can use the builtin (I believe you need to download it for win 8) Microsoft Expression Encoder 4.  I haven't tried it with windows 8, but EE recommended it for win7.

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Paul SauvéRetiredCommented:
AVS Video Editor 7.1 has a screen capture option as well.
Capture Your Video
Transfer video from DV-, web- or VHS-cameras and save video on hard drive or burn DVD discs. Or record media files from your PC screen and create video guides, training videos or demos.

The non-activated version of the program has no function limitations, although the watermark banner will be placed in the centre of the output video file.
The unlimited (lifetime) license for the suite of tools is $59.00.
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I have tried next software (40$) and I can say the converter inside is good because it compresses the end file a lot, making very small files:

Another which I tested in the past and is good(30€):
Thomas Zucker-ScharffSolution GuideCommented:
Did you look at camstudio?
mkl-siAuthor Commented:
quickest and most thorough answer, gave specific answer plus options.  Thanks!
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