Regarding sw 2008

Dear All,
At present i am using sw 2007 and i could not update this to anyfuture version though i have the recent versions of sw cds. becausemy parent company is using sw 2007 only.

most of the sw files posted in this forum are in future versionsay 2008 and i could not open these files in 2007

is there any way to open these files? or could i able to installboth sw2007 and sw2008 so that i do my work in 2007 and use 2008for forum files.

regardsSolidworksParts And Features