I have the same issue. The game crashes just before it reaches the half of the loading bar. Singleplayer works fine, and so did SAMP before I updated it to 0.3.7.
I've tried running as administrator, renaming the San Andreas map, re-installing SA:MP, rebooting PC after clean install (uninstall, then install again). I've also removed gta_sa.set, to no avail.
EDIT: Tried running in compatibility mode, but also no use.