Hi @Tesla1856,

Thanks for replying.  I like your idea of having Win10 on a separate drive, but my 2nd HDD is used for storage.

I think you might've helped me make up my mind to just do a clean install.  Win7 Home has update glitches that can't be troubleshooted.  (I didn't get around to trying the command screen just yet.)  I have Win7 Pro 64-bit on DVD for a backup.  If I reload Win7, I'd have to run updates on 2 OS's.

Well, for one thing ... I suggest installing it on it's own HDD/SSD. That way, if things go badly, you can always disconnect one-or-the-other. 

Yes, at one time I temporarily had both Windows-7, and Windows-10 installed on my Aurora-R1. Just a little "Microsoft Dual-Boot" test of Windows-10 for the first time. It worked fine. The pre-cursor to this: 

https://www.dell.com/community/Alienware-General-Read-Only/Alienware-Aurora-R1-Windows-10-Pro-Upgrade-Smooth-sailing-so-far/td-p/5512004

But I erased it all when I re-imaged. Also, the Aurora-R1 is Legacy-BIOS (non-UEFI). I've never tried it on a UEFI system.

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@bradthetechnut wrote:

Hi @Tesla1856,

1. my 2nd HDD is used for storage.

2. I think you might've helped me make up my mind to just do a clean install. 

3. Win7 Home has update glitches that can't be troubleshooted.  (I didn't get around to trying the command screen just yet.)  

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1. If keeping machine, probably time to drop in a SSD (a 256gb SATA is cheap). Install Windows-10 to that.

2. A Macrium Reflect image (with Verify on) is that same as keeping the HDD un-touched. You can always re-image back to where you started from.

3. Yeah, Microsoft hasn't really touched that OS in many years.

The OptiPlex 755 is a 2007 Model that has a Legacy Only BIOS. It should work with Windows 10 64 Bit. I recommend installing it with a USB Flash Drive opposed to a DVD. Makes sure it is NTFS formatted and uses the MBR Partition Scheme:

https://dellwindowsreinstallationguide.com/windows-oem-faqs-and-downloads/ 

It is recommended to replace your hard drive with a solid state drive as otherwise you may be stuck with severely reduced performance and Disc Usage at 100 %:

https://dellwindowsreinstallationguide.com/upgrading-to-a-solid-state-drive/

Also the Windows Vista Business OEM License or Windows XP Pro OEM License affixed will not work with Windows 10 Pro. If you have a Windows 7 License, you can enter your Windows 7 Retail Product Key During Installation and it will activate when online. If you install Windows 10 without a key it will be watermarked and some of the settings will be greyed out but otherwise it is usable.

The oem Audio Codec and CHIPSET and INTEL AMT drivers will need to be used. Everything Else is built into windows XP/VISTA/7/8/10.

There are no issues whatsoever but windows 7 8 and 10 are not supported. This doesn't mean it does not work only that its not supported.

UBUNTU 18.04.2  LTS Bionic Beaver also works fine on these systems and can be installed ALONGSIDE windows.

http://releases.ubuntu.com/18.04/ubuntu-18.04.2-desktop-amd64.iso

Thanks for all the replies.  I have a Dell OEM drivers disk, so I think I have the drivers + Dell Support Assist.

First - Success - I'm now running Win10 from an SSD.  Is it ever fast; only a few seconds to boot up.  RAM was upgraded to 8G and tested with Win7 before changing drives and OS.

SSD I'm using is Crucial.  I couldn't afford Crucial RAM, so I got A-Tech, which is new with a lifetime warranty.  It replaces 4G of Hynix easy-freezey RAM that came with the refurb.  Using multiple USB ports would freeze it too easily. 

Second - Here's the catch - If I plug in my HDD used for music storage, I get error codes 2 & 4 for some type of video failure.  I can try reseating graphics card, but I don't see how it's related.

Solved:  I unplugged the SSD and plugged in the HDD.  I powered on to make sure the HDD showed in the Boot Menu.  I powered off (unplugged a.c. of course) and plugged the SSD back in.  The HDD now shows normally.

Am I ever happy with how the system turned out.  USB 3.0 is about 10x faster than it used to be.

If I run into problems, I'll continue to post.

Old drives should be docked not put inside.

https://www.amazon.com/Inateck-Dual-Bay-Docking-Function-FD2002/dp/B00N1KXE9K/

That 755 was never quite right before  with the USB ports.  2.0 would work slower than 2.0 on XP.  Even transferring a word.doc would be a little slow.  Adding USB 3.0 only saw somewhat better performance.  I kept wanting a newer PC.  Yet the PC worked fast for everything else and could easily multitask.  But I had to make sure my taskbar wasn't loaded up when putting to sleep or RAM would freeze.

Now the thing is a dynamo all the way around like it should be.  My 755 is now faster than the newer Dell's at the library (3020 SFF, 390 MT).  Something I had in a separate post - Last winter I replaced the Duo E8400 with an Intel Core 2 Quad Q9650.  It's not an I7, but a quad is better than a dual or duo any day of the week.

I remember being impressed with either the GX520 or GX620 in 2006 when I worked at Thrivent.  A computer that was finally as fast as me.  I didn't like the previous Dell's that it replaced.  My attitude is technology is the intelligence of a collective, not the intelligence of one, therefore, should always be as fast me.