Simatel-IDT Systray Problem

P4, Win XP Pro.

Lately can't recall just when but I get the message when closing down Sigmatel-IDT Systray is not responding.

And today I notice that some of the Icons are missing from the System Tray, notably ESET Nod32 but it appears to be working ok.

I haven't installed anything new for well over 12 months, however I did update Zone Labs about a week ago to the latest version and noticed a problem between Windows Mobile 6.1 on my Palm Pro PDA when syncing Contacts and Calendar with MS Outlook 2007 which I wasn't able to resolve, I then un-installed Zone Labs and that's when I noticed the Icons missing from the System Tray..

Anyone have any idea what may have happened and how to fix?

Thanks for any help.