LHC@home

I have 4 core processor, 1 my processor is desapear, now I am crunching with 3 core.I unistall and again install Boinc, again I have only 3 processor.Whate happen ? , how I can fix it ?

I am not certain what you are writing about. Have you checked to see if there are 4 cores shown when you check the performance tab of the task manager when you press Control + Alt + Delete, click "More details", and then click the Performance tab? If there are 4 cores shown, then something could be wrong with your BOINC preferences, or maybe your computer might just not have enough memory to run 4 tasks at once and satisfy the amount of memory that must be left free. You could also have set the preferences to only use 75% of the CPU, leaving one core free. Another possibility is that your computer could be infected by malware, in which you might have to let all of your tasks drain by putting your projects on "No new tasks" mode, and then reformat your computer. Finally, your CPU is really old. Could one of the cores have failed and therefore be shut down by the power on self test?

Thank you very much, my preferences was wrong set, now I fix that problem.How I running on full 4 core.Yes my CPU is old too :( , in future I have plan to buy new much better.

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I just realized that I made an error in my advice about letting tasks drain out if you have a malware problem. You should set the No new tasks mode, abort all tasks, report them, capture and submit the malware sample to your antivirus company if you are able to do that, and then reformat your computer if you have a malware problem.