First exit out of boinc
Download the latest version here http://calbe.dw70.de/boincw.html
Use SSE for P3 and AMD Athlon XP/socket A semprons, and use the sse2 for all cpus on the socket 754, 939 or AM2 platform along with all Pentium 4's
extract the files into C:/programfiles/Boinc folder, then say yes to all
open up boinc and watch your benchmarks skyrocket
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