hint: read the link polonus gave you … this section in particular 
[i]…
A blue or green colored “flick” of the traybar icon will be noted when BOClean does this recalibration every ten seconds. The icon’s black vacuum cleaner will turn BLUE when memory is being examined in connection with a program starting, it will flick green when it’s doing a routine examination of the registry during a recalibration. Formerly, BOClean would flick RED during the recalibration cycle which confused people, causing them to think a trojan had been caught, or worse, MISSED. As of BOClean 4.12, you will ONLY see the icon turn “blood red” IF a trojan has been caught and an alert is being triggered OR if you open the configuration screen or button bar, during which time BOClean goes “quiet” and you’re unprotected. It will REMAIN red until all cleanup has completed, or when you close the button bar, whereupon BOClean will start its examination cycle again with the icon being blue until it has REscanned ALL memory andrecalibrated itself.
You will also see the icon turn blue and remain blue at startup or when BOClean has been stopped for configuration and the menu is closed when you’re done with the button bar and configuration screen. Disk activity will be furious as well as BOClean examines not only memory, but all of the files and associated system libraries associated with each process, task, or device driver. This may take a while depending on how many items are currently running on your achine at startup time. BOClean will examine every detail at startup, and this may take some time. BOClean is designed to yield to other tasks with higher priorities, so don’t be surprised if the icon remains blue for a decent period of time at startup or “start from zero” recalibrations. This is NORMAL. At any interruption of BOClean, it will discard its internal list of already examined items and start from scratch with a blue icon color. It will REMAIN blue until BOClean has finished all examinations, whereupon it will revert to its green flick every ten seconds when the system is examined and remains “quiet.” BOClean will immediately respond as soon as a trojan prepares toactually start running. If BOClean remains quiet, all is well.
If a “trojan horse” or other malware is present on your machine, BOClean will shut it down FIRST, then you’ll receive a warning box and you will be prompted by BOClean asking if you want to remove the offending file and clean up its remains. If you are running BOClean in regular standalone mode, you will be able to hit YES to perform a safe cleanup, or you can hit the NO button to delay cleanup if there is some valid reason. If you hit the YES button, the trojan horse will be removed from your hard disk and the windows registry. There is NO NEED to disconnect from theinternet or your network and a reboot is not necessary either. In the RARE situation where you are using a remote control trojan horse or other known malware and INTEND to be using it, you can use the BOClean EXCLUDE screenas described later to tell BOClean to IGNORE any nasties you INTEND to use for whatever purposes. You can ALSO use the Excluder to tell BOClean to be gentle on any poorly behaved programs from other vendors that make themachine crash. See below.
If a program or the desktop itself has been infected by a memory “injection” into another program, BOClean may shut down a legitimate program which is infected, or may reset your desktop, causing it to go blank and then reappear. This permits BOClean to destroy the injection. Under the most EXTREME circumstances, BOClean might even force a system reboot. Only a small handful of trojans are so severe as to require this drastic a step, but in such a situation, BOClean is “smart” enough to know when such a drastic step is required and will do so if absolutely necessary in the rare event that a nasty cannot be stopped by any other means.
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A nice proggie, just wonder how effective it is ? Any reviews ?
