I've tried everything I can think of to fix this problem, but it is occurring on two of my computers. When I go into a game of Team Fortress Classic, sometimes my ping will be stable. More often, I will play for a few minutes and suddenly my ping shoots through the ceiling, I get a CL_FlushEntityPacket error. If I don't exit, I get a Net_SendPacket error. The last one read (get this): Net_SendPacket Error: No Error Now, that's just nuts. This is happening on two computers with similar hardware. It is also happening to a lot of other online gamers and there doesn't seem to be a fix that helps everyone. Stuff I've tried: 1. Disabling QoS Packet Scheduler 2. Re-enabling QoS Packet Scheduler 3. Disabling my NIC 4. Disabling my sound card(s) 5. Making sure comm port and modem port speeds were set to 115200. 6. Setting comm port and modem port speeds to 57600 7. Disabling the firewall 8. Disabling all startup items 9. Disabling TCP/IP on my network card. 10. Installing IPX protocol 11. Turning on EAX / Turning off EAX 12. Uninstalling XP PowerToys 13. Setting game to run in Win 98 compatibility mode 14. Installing the latest 4 in 1 drivers 15. Setting flow control to hardware 16. Setting the QoS bandwidth limit to zero. 17. Other stuff I can't think of right now. Some of these sound like voodoo magic, but others claimed it solved their problems, so I tried them. Both computers are connecting directly to the Internet via USR Courier v. Everything External modems Hardware for Computer 1 Experiencing this Problem: 1. IWill KK266 2. Athlon 1 GHz pencil tricked to 133 FSB 3. 256 megs of PC-133 SDRAM 4. Gainward GeForce3 5. SB Live! 6. On-board C-Media sound (I have used two sound cards in the past with no problems...long story as to why I need two) 7. Two Courier v. Everything EXT. modems (I use multilink for downloads...fastest thing I can get here and yeah, I know it sucks.) 8. Realtek NIC with four computers on LAN 9. Intellimouse Optical (USB) 10. Other USB items Computer Number 2 1. IWill KK266 2. 1 GHz T-Bird Pencil-Tricked to FSB 133 3. 256 megs PC-133 SDRAM 4. On-board C-Media sound 5. Radeon LE 6. Realtek NIC 7. Courier v. Everything External Maybe it's a stupid VIA problem. I don't know. Computer number 1 is running a fairly recent BIOS, the one that supposedly fixed the SB Live! and IDE transfer problems. I'm really at my wits' end here, seriously considering going back to Win 2K. I don't know how long to wait before throwing in the towel and re-formatting back to an earlier Operating System. Has anyone here heard of this...do you have some ideas for me?