Chris, there is not exist any arcgis desktop at 64 bit. Only the Arcgis pro, but is not contains any parcel tool as far i know.
If you use Win7 x64 the minimun requisite to work is arcgis 9.3.1 with all service packs
Win8-->> Arcgis v10.2.1
Win8.1 -->>Arcgis v10.2.2
If you have Win7 x64 Bit SP1 ArcGIS v10.2 will work as x86 program without any prblem. But i suggest you to download the v10.2.2 installer. Or simply download the 10.3.