The expansion bus has nothing to do with whether or not the system can run 64 bit. It is the processor and the chipset that determine that. 64 bit refers to the code in the programs and how the processor can handle the word. 
Hi I am going to install win 7 ulitmate 64 bit on my dimension 9200. However in the Specs, witch i have attached, it says that on the mainboard, the expansion bus is: 32 bit. I have also gone the Vista software and into the controlpanel, under system, where it says that the computer can run 64 bit. What should i do? I am very confused Danny from DK   Flere detaljer om min computer   Komponent Detaljer Underscore Grundscore Processor Intel(R) Pentium(R) 4 CPU 3.00GHz 4,2 4,1   Fastsat efter laveste underscore Hukommelse (RAM) 2,00 GB 5,5 Grafik ATI Radeon HD 2400 Pro  5,9 Spilgrafik 1022 MB samlet tilgængelig grafikhukommelse 4,1 Primær harddisk 132GB ledig (466GB samlet) 5,9 Windows Vista (TM) Home Premium   System     Producent Dell Inc.    Model Dell DXP061    Samlet systemhukommelse 2,00 GB RAM   Systemtype 32-bit operativsystem   Antal processorkerner 1     Lager     Samlet størrelse på harddisk(e) 466 GB   Diskpartition (C:) 132 GB ledig (466 GB samlet)   Mediedrev (D:) Cd/Dvd   Grafik     Skærmkorttype ATI Radeon HD 2400 Pro   Samlet tilgængelig grafikhukommelse 1022 MB         Dedikeret grafikhukommelse 256 MB         Dedikeret systemhukommelse 0 MB         Delt systemhukommelse 766 MB   Version af skærmkortdriver 8.671.0.0   Primær skærmopløsning 1280x1024   DirectX-version DirectX 10   Netværk     Netværkskort Intel(R) 82566DC Gigabit Network Connection   Netværkskort Microsoft Tun Miniport-netværkskort   Netværkskort Virtual Machine Network Services Driver     
WIN 7 ultimate 64 BIT on Dimension 9200