Well done TD
To tweak it go
HERE and download the 'Boinc 5.2.13 Windows SSE2' (for your dual core - and also for your other PC if its an Athlon64 CPU - if not use the Athlon XP SSE one) to your desktop.
Firstly go to your WCG personal page, log in and go to My Grid>Device Manager>Device Profiles>Boinc Default Profile. Then make sure that under 'Disk and Memory usage' that you select YES to 'Leave applications in memory while preempted?'
Then go to 'Messages' in Boinc manager, and note the two benchmark figures.
Stop Boinc Manager and exit the program.
Right click the download and select 'extract to' or similar depending on your extractor.
Browse to the Programs/Boinc folder and extract it to there.
Select overwrite existing files.
Done - re-boot - Open Boinc Manager and go to Commands>Run Benchmarks (do NOTHING on your PC until it finishes!)
Then go back to Messages and note the new benchmarks, then please report back here so we can see the improvement
Any problems, come back
Note: I will be away until Sunday evening very shortly...