This user forum is packed with help and advice on upgrading to Windows 10. In addition, the internet has thousands of pages of detailed information on upgrading to Windows 10. All the help you need is out there, but you have to make the effort.

I was able to upgrade my ancient (2009!) Dell desktop to Windows 10 on my own and you can do it too. In addition, by preparing on your own your chances of succeeding on the first try are much better than if you leave your fate to Dell technical support. Just saying.

Which year did it come out?  Did it come with Windows XP?   What are the specs?

It came with Windows 7 Home Edition, which I later upgraded to Windows 8. Dell didn't support that either. Then to Windows 8.1 and now, Windows 10.

I had to do all the research and planning on my own, but the benefit was that my upgrades were perfect on the first try with zero problems. I trust myself more than I trust Dell technical support.

I'm pretty sure if it will run Windows 8, it will run Windows 10.  You can use the 8.1 drivers if you run into any issues (as many have using Dell Windows 10 drivers).

Hi Ive had this Optiplex 745 about a year and it came with Windows 7 installed, but when i check the Dell site  It tells me the drivers for this are not available. Ive tried the Windows 10 download at leadst 8 times with no joy.

Thanks

Most of whatever driver versions will work fine. The drivers control the hardware, not the software. The only issue for older computers, those 8+ years old, will be video drivers.  Even then they can run successfully with the MS generic driver. My E1705 installed and ran OK using the generic driver. The negative is not being able to set text and icon sizes. Windows installscompatible drivers if any are incompatible.