Re: Inspiron 1545 - Random clicking/popping noises
The driver is still on DELL site. Go to http://www.dell.com/support/drivers/us/en/04/Product/inspiron-1545 , choose the XP dropdown, under audio, you will see 2 versions of the driver, the 2009 version works for sure.
I no longer have this notebook. I think DELL may have fixed the problem so the 2/7/2012 should work as well.