10.6.4 Driver Update
10.6.4 update = new patched drivers for your Dell Inspiron 1545.
Update your notebook using apple software update. Remove, if you have installed, any SleepEnabler.kext from /Extra/Extensions. It’s useless for this notebook, and causes kernel panic on every kernel update.
After reboot, replace the usual two kexts for audio and wireless with the patched ones: