Images From Vendor Not SysPrepped (Is This A Problem for Agent?)

Hello,

We have about 200 machines that were imaged and setup by an outside vendor.  We discovered that these machines were not SysPrepped.

We are planning push the Altiris agent to all 200 machines.   Could this present a problem with duplicate GUIDs and give us a problem managing the machines?  If so, is there an easy fix or do all machines need to be reimaged?

We are running SMP 7.1 SP2

Thanks for any guidance.