Unfortunately, since the BIOS has no options for timings, you can't change it. However, what you've reported looks like SPD data (the presets stored in the DIMMs), not the actual current settings. Run CPU-Z to find out the actual current settings.
Download and burn the bootable CD image of memtest86+ to test whether your memory is giving any errors. Also, don't forget to set the RAM/DIMM voltage in the BIOS to that required by your specific DIMMs if they require something other than the DDR2 standard 1.8V.