Upgrade Win200AS to 2processors

Hi !!!!
I need some help. I have one IBM Server with Windows 2000 Advanced Server.

The Server is new, but my hardware provider only gave me one processor with
ther server, and the another processor will give me until next week. The
question is, if I installs all aplications in that server, for example: ISA
Server, Exchange Server, when my provider installs the another processor, I
NEED FORMAT THE SERVER??? I NEED REINSTAL ALL????

Please help me