Sometimes it happends that windows blinds removes all your icons except 2 or 3[usually sound, network status and in my case antiviru prog. stays visible] in your taskbar..
(This happends when u make some changes inside windows blinds)
The only solution i have found for this is to
1. Use startmenu to open windows blinds
2. choose another skin
3. restart windows..
Found this out while fooling around with WB 7 for the first time.. picked a random skin for some random things just for fun to see what happend.. and ups.. icons gone.. hehe