WordNet (r) 3.0 (2006):

reactivate
    v 1: activate (an old file) anew

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "reactivate":
   activate, give back, mobilize, place in, put back, recharge,
   reconstitute, reconvert, recruit, reenact, reestablish, refill,
   reform, rehabilitate, reinstall, reinstate, reinstitute,
   reintegrate, reinvest, rekindle, remilitarize, renew, renovate,
   replace, replenish, restore, resurrect, resuscitate, retrieve,
   return, revest, revitalize, revivify