Ensure you have the latest BIOS revision A04 installed before proceeding. Its recommended to clean install Windows 10 TH2 opposed to Windows 8.1 (its more likely to have the drivers you need inbuilt). I advise taking the  Unofficial Windows 10130 Upgrade path, see here for details: [URL] The intel Chipset will be inbuilt and the Intel 965 GM will be obtained automatically from Windows 10 Update. Windows 10 should have inbuilt drivers for the Dell Wireless (Broadcom) cards and the Realtek LAN. The Alps Touchpad you may need to try force installing the latest version via the Device Manager or using the inbuilt driver: [URL] The Ricoh card you may need to install the Windows 7 driver: [URL] Not sure about the Conexant audio but likely the driver will be inbuilt. 
Hi  I want to upgarde my old dell  vostro A840 from XP  to win 8 64 bit will it work?  will the hardware support it  ( core due T5470 2M cash .I did not find any support in Dell site  for drivers and Bios thanks David
A840 upgrade from XP to win 8