WIN XP PRO crashes immediately after completing install of BOINC - Bad_Pool_Header

Tried safe mode restart, no dice. Atempted uninstall, BOINC not on program list population (ADD/REMOVE PROGRAMS) under any user including admin and user acounts, but listed on Start menu - submenu BOINC Manager. Could not start manager before repeated system crash. System Restore tried to auto restore point of original BOINC install, same crash afterard. Anyone experience similar problem? Any advice?