I would do an online scan here first if I were you.
http://housecall.trendmicro.com/
Spybots Search & Destroy will find things Adaware will not.
http://www.net-integration.net/spybot/spybotsd.html
I would check your firewall's log or allow list to see what is dialing out. You should also disable autodial in network connections as well. Someone could be ringing up a honkin big phone bill - yours. You can delete Alexa.