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:

-Audio: AppleHDA 1.8.7f1, patched for IDT  92HD71B7X. Download
-Wireless Dell 1397: IO80211Family patched to enable 14e4:4315 devices.   Download