I restarted my computer because of some updates, and now my screen is 640x480 and 16 colors. I can't change it. Troubleshooters don't help. I am running WinXP Home SP3. Another suspicious thing is that I found my firewall turned off, port 80 opened completely, and my antivirus's real-time shields turned off. I quickly corrected these, but the graphics still look ugly. Help!