Just from reading another thread where a person had the same problem, one of the suggested fixes was to reinstall Java. As some people have had trouble with the latest Java update 1.6.0_01 I suggested using an older version which is known to be a bit more reliable.

LW's written in Java. Java Runtime Environment (JRE) is software that allows you to run Java based apps...like LW.

Go to your control panel > add/remove programs & your Java version should be listed.

If you don't want to reinstall Java that's up to you...it was just a suggestion.