Can't Launch Videos/Can't Use "Explore"

[zavibaby]

I recently upgraded my AV (TrendMicro PC-Cillin 2007). Coincidentally (or not), I have had these problems since: 1) LW will not launch any videos from my Saved Files; 2) LW does nothing when I choose "Explore" (normally it would open my Shared Folder so I could listen/watch in RealPlayer); 3) the Help Topics will not launch in LW; and strangely, 4) my speakers are now very soft (max volume is barely audible, but the speakers work when plugged into other devices). I am using Windows XP. I have searched the LW site, poured over the Forums, downloaded updated versions of Java and RealPlayer, run virus scans (all clear), configured the Windows firewall, checked all volume settings, pulled out my hair, and am at a loss. Any suggestions are most appreciated. Thank you, in advance!