If you got it from microsoft they may offer customer support although this is not likely so any thing that goes wrong is not there fault.
If you've got a warez version (illegal) then DO NOT INSTALL IT...
1) Its illegal
2) It could be full of bugs and virus that hackers have put on it.
In either case if anything goes wrong with beta copies its YOUR problem.
I would just make sure that you have backup disks for the system so you can restore it.