Windows Vista & Windows XP

[#1]

I have a A205-S5000 with vista home premium with SP1 and this error keeps occuring.  Everything on the task bar on the bottom of the screen quits responding and will not do so until i click the start button a few times till it tells me that the windows explorer isn't responding and gives me the option to check the web for a solution and close program, close the program, or wait for it to respond.  I've used the first 2 options more than once and it will start running normally again after choosing one but not all of the icons on the bottom right are there until I log in and out again.

Solutions?  Anyone know what the problem is?

[#2]

Satellite A205-S5000 

Try installing Service Pack 2.

   Information about Service Pack 2 for Windows Vista and for Windows Server 2008