Go Start and in the search box type msconfig
Select the file that appears at the top of the list
Select the Startup tab
Deselect the following :

Acer Assist Launcher
Acer ePower Management
APSDaemon
EgisTecLiveUpdate
mwlDaemon
TkBellExe

OK out and reboot

Also remove Open Office and WkCalRem.exe from the startup menu
Go Start > All Programs > Start-up then delete those two (they are just links and will not affect the programme