Managing Multiple Versions of LabVIEW on same Computer

With a new version of LabVIEW coming out every year, and service packs every 6 months, what is the best way of keeping different versions of LabVIEW (8.6, 2009, 2010 SP1) on the same computer, without being effected by new installations?
I have read up on some people using virtual machines to do this. From past experience with virtual machines, I remember only being able to
use a single monitor with the VM. However, it is very helpful to have 2 monitors when programming; are there VMs that can run in 2 monitors (just like
a normal OS?)
Thanks for the input.
--CLD--
LV 6.1, 8.6.1, 2011 SP1, 2012 SP1

Hi Jim,
I have installed multiple versions of LabVIEW on the same PC.  When doing upgrades, such as a service pack, it does not affect other installed versions.  This was done as a regular install in the OS, not using Virtual Machines.
I have been doing this since 2001, and for some customers, they have versions ranging from 6.1 to 2009.  Only in one recent situation has there been an unusual event with multiple parallel installations.  It was due to a DAQmx driver installation (long story).
Overlaping drivers should not be an issue.  The issue with the DAQmx driver was that I forced to revert a LV8.2 driver by cheating on the installation.  It worked for 8.2 but screwed up something in 2010.  That was because I did not install the DAQmx drivers the way they were supposed to be installed. 

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