[Ex-Wretch]

Yes, I have Norton Internet Security and SystemWorks - plus whatever you get with Windows XP and IE7.

[GoLightly]

Norton Internet Security could be your problem. Some file may have gotten corrupted in the compression. Uninstall it & check to see if you're still having the problem.

[TChad]

By the way, you said above that you have both Norton Internet Security and Norton Systemworks installed. Both of those programs include Norton Antivirus. I hope you only have one version of NAV running. The installer program should handle that automatically, but I don't much trust Symantec these days.