This model and Operating System is not supported by Dell. Remarks: This system might not run Windows 7 64 bit depending on the processor installed. Run the Intel Processor Identification utility to confirm. Recommended Hardware Upgrades SSD – Solid State Drives This unit accepts a 2.5″ Form Factor SATA SSD see Upgrading to a Solid State Drive It … Continue reading Dimension 9100 – Windows 7 and 8.1 32 Bit