Hi, could anyone help me to find all drivers for Dell optiplex 745 for win 732 bit or win 7 64 bit please.

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Go to Dell support and they have a tool that will scan your system for driver and BIOS updates, they can all be installed under Windows. I installed Win7 64 (up from XP 32. I had no problems. I believe XP drivers work in 7. Check to confirm this as I'm not an O/S expert. My Dimension E520 is probably much older than your Optiplex so I don't think you should have any problems.
Go to Dell support and they have a tool that will scan your system for driver and BIOS updates, they can all be installed under Windows. I installed Win7 64 (up from XP 32. I had no problems. I believe XP drivers work in 7. Check to confirm this as I'm not an O/S expert. My Dimension E520 is probably much older than your Optiplex so I don't think you should have any problems.
 
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