I saw from your email addy that you use AOL. One of their offers is a security version which includes a spyware program. Unfortunately it isn't a very good one & it thinks LW is a spyware & thus removes it. You have a choice. Check the program's options & set it to ignore LW. Or disable it & get a decent one that's recommended by the spyware forum. 1.
Spybot - Search & Destroy (FREE), perhaps a good idea to also get this one 2.
ad-ware (FREE)