spyware blaster is about prevention rather than treatment; ad aware will allow spyware/ malware etc to infect the pc, and then you can scan for it afterwards.
spywareblaster will prevent most spyware from infecting the computer in the first place.
I use a combination of spyware blaster and adaware on my pc.
more info and download here:
http://www.javacoolsoftware.com/spywareblaster.html
hth
EDIT: there are no conflicts between adaware and spywareblaster