Your choices are to keep an old xp machine around, or upgrade to Indesign CS6. Some people claim to get Pm to work right in win 7-10, but the printer driver will not work, making pdf export unreliable at best.
Upgrading to IDCS6 is expensive and a bit of a crap shoot, results vary from garbled mess to fairly straight forward, depending on how your file has been created. ID doesnot work well with embeded images or OLE links, but you will be able to update documents on your new setup. The old XP machine is probably the best way to go.