Since installing 7.6.22 the fan keeps running - it did
not with previous version - I set pref. to 50% instead
of the 90% and still is running - does stop every once and
awhile!!
Thanks

Maybe because your Activity menu setting got changed to run always instead of run according preferences.

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Coelum Non Animum Mutant, Qui Trans Mare Currunt

If you're using windows you can select another power profile with maximum CPU frequency of something like 95% rather than 100%. This should keep the processor from entering highly energy inefficient turbo boost frequencies.

It might also be some other application. On windows pressing ctrl-alt-del lets you enter the System monitor utility to monitor what processes are running in the background and are taking up CPU time. Often, something that automatically starts up at login, like Skype, is to blame.

If you're running linux, there usually is a frequency selection taskbar appllet you can add. Or, you can on the command line set the frequency via the command

cpufreq-set

Eg., the below should set the frequencies to 1.9GHz, for cores 1-4:

cpufreq-set -c 0 -u 1.9GHz
cpufreq-set -c 1 -u 1.9GHz
cpufreq-set -c 3 -u 1.9GHz
cpufreq-set -c 2 -u 1.9GHz

The command cpufreq-info lets you know what frequencies are available. (this is optional, since the frequency set command improvises pretty well if you don't give the exact frequency).

Thanks for reply - running on XP SP3 - the only things
that seem to be taking up cpu is period_search_10... and
system idle process.

I know system is old -
Thanks

Might be time to clean out the CPU fans and reapply thermal compound? They get clogged up and break down over time, and become less efficient at conducting heat away from the chip.

Also, you could try something like tthrottle to scale the BOINC computation down on the fly to maintain a specified temperature.

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My Detailed BOINC Stats