This could be caused by any number of things, including malicious software on your computer.
Usually, however, something you have installed is having a conflict with the Linksys network card's drivers or monitoring software.
The best first step is to check for updates to the software, and install the new version if there is one. If not, remove the one you have now, and re-install it.
It is also a great idea to make sure your computer is clean of viruses, spyware and other malware. Your anti-virus program should take care of the virus issue. If you don't have one, you need one.
The malware is better handled by other tools. May I suggest you download and run both of these:
Between those two, most everything will be found. There are exceptions, of course, but these would, for best results, require someone to look at your machine in a shop. [ DangerNerd's advice column | Ask DangerNerd A Question ]
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