I wanted to know what i need to upgrade my cpu. i have a mce 2005 with a AMD athlon 64 and i want to upgrade it to Athlon 64 x2 and i wanted to know if i need o update the bios or reinstall windows? Do i need a new heat sink and i new fan or can i use the same one being the same socket? what do i need to do to intall it and how to install the cpu? Thanks.