this applys to my 405 so should be the same with your player, as i had the same prob only some of the stations updated and it cured my prob
First make sure you that your clock and date are correctly set.
If you still cannot see your TV guide, and you are sure it has been copied by ArchosLink to your device , try the following:
• Make sure that you have Windows Media Player 10 or higher on your computer.
• Set your device to Hard Drive mode (Menu > Settings > System > USB mode).
• Connect your Archos to your PC and open up the folder “System” of the Archos.
• Delete the files “epgdata.hds” in “System” and the file “epglist.dat” in the folder “EPG”.
• Reconnect to your PC, run ArchosLink, and select the “Update TV Program Guide” and then click on the button “Download”.