I've been running LW, adaware, spybot ect...for over 4 years now and have only had one instance of spyware in LW.
Now Kazaa and Morph are a different story, they Flood your machine with all kinds of crap just on installation! Let alone while your connected. Don't use them!
*Be careful what types of files you download.
*Check the sizes carefully.
*Know approx what size the file your downloading should be.
*After every batch of downloads, run a virus/spyware scan on ALL those files BEFORE running them!!!!!!!!!!