Hi kellico,
If you got your version of LW from the official site, it will be clean. Get a scam version & it could contain anything. Certain spyware & adware removal programs might detect LW as either or both. Not true. False positives. eg older versions of No-adware always found LW and this is because it was a crap program. I think the newer versions of No-adware have improved a bit.
Reliable programs are Spybot & Ad-Aware (both free)