Might be a Java Issue. Try Updating.
Remove All Java versions installed (via Add/Remove Programs) before you install the latest Version. (Download the JRE Offline Installer)
Java SE Downloads Fifth one down.
It is Extremly Important to get some AV protection NOW. Try this, it's Free.
AVG Free Advisor: AVG Anti-Virus Free
Security is the First thing you should be concerned with, Not LW. Just my opinion.