two version of solidworks in on pc

Dear all,

i have an issue now with solidworks.

i installed SW2013  and SW 2014 in same pc. and for 2013 i give the file locations to the local drive and this is working fine

and for 2014 i give the file locations to epdm. but this is not working properly. what is the cause of this.is it possible to have same versions in one pc?

pls advise me asap....

SolidworksSolidworks Pdm enterprise Pdm