I understand that multiple versions of Solidworks can exist on the same computer.    Because of having to be concurrent with a number of clients,  I have SW 2012 SP5.0 and 2013 SP5.0 already installed and now I need to also install SW 2014 for a client that just upgraded.     I have had three versions installed like this before with no apparent problems.

My question is:   can this cause registry or crashing issues?    Does this complicate matters if I later decide to uninstall one of the versions, say 2013?

Last time I uninstalled them all at once (2010, 2011 and 2012)  and did a clean dirve and registry sweep before reinstalling 2012 because I was afraid of problems later in case shared files got accidently deleted, etc..