ok, i think whats happening is the office "quick launch" system tray crap is failing to load. if you open any office program from a short cut on desktop or from in the start menu you never use the quick launch feature. could have a go at dissableing it.. see if that stops it..
heres how to do it (yes i know its crude but it works):
press and hold windows key then press "R" you should get the "Run" command pop up.
type in "MsConfig" and hit enter
you'll get "system configuration" window open with a few tabs to choose from.
click on the "Startup" tab
now you'll have a load of stuff in here that starts up with windows.
anything MS office related un-check it (you can uncheck other stuff in here you dont use, makes the PC load up faster)
failing anything office related being in that tab, try the "Services" tab.
look in there for anything office related and un-check it.
if you find office stops working just undo what you have done..
dont go trigger happy on the un-checking things though, heh you can disable the OS from loading up on later windows.
hope this helps.. oh and check youtube out.. people do a video walk through of what you have to do to disable things from starting up when windows loads.