From the standpoint of an electrical shock, this practice is safe.
Many electronic devices use the ground as a reference.
Further, surge protective devices may not function properly without an equipment ground. For the safety of your equipment, have an electricain install a lightning arrestor on your service, install a properly grounded dedicated circuit to your computer along with a high quality surge arrester receptacle. Many electronic devices use the ground as a reference. Further, surge protective devices may not function properly without an equipment ground.