It's most likely either a virus or a spyware.
Get your computer scanned by a good antivirus.
Also check for spywares .. using 'Ad-aware' or 'Spyware Search and Destroy'
Other than that .... next time you want to share an image .. upload it to
http://imageshack.us and give us the link
Uploading is not possible in this forum.
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alibi