Nah...he is saying if you removed Google Talk service, then it will cause a problem.
Do you have Sync turned on and is it syncing?
When you go into Accounts and Sync settings, Above Manage Accounts, click Auto Sync. Then the icon beside the account will turn green.
In the next few seconds, in the top Notification bar, it will show a little icon that syncs the account.
To see if it is done, click on the account below that says Sync is On, and then on the page that shows what you are syncing it will show the date and time that it last did a sync.
If it's not syncing at all, then it could be the button on the Power Control Widget
Why not just add the Power Control Widget on one of your screens and press the Sync button whenever you want it to sync? You could do that.
That Sync button in the Power Control Widget needs to be on too.
Is all that stuff on? If you go into the gmail account, when is the last time it says it did a sync?