ST380815AS  is a VERY VERY OLD Drive.

These units can be upgraded to 10 HOWEVER you can get a much better much faster unit like a 9020 Tower for almost the same price as the cost of the windows licence.

There is a reason why drives have a 5 year max warranty.

Updating to the latest bios will allow drives up to and including 2TB.

https://www.amazon.com/Seagate-BarraCuda-Internal-Drive-3-5-Inch/dp/B07H2RR55Q

This is not a hugely expensive drive.

Windows 10 is not supported but will run fine on a 755.

An OEM 10 DVD is the recommended install media.

https://www.newegg.com/microsoft-windows-10-pro-64-bit-reinstall-recovery-disc-only-no-license-key-included/p/N82E16832350238

Once installed with the I dont have a key option for Home

$109 or Pro $199 you can purchase a key from microsoft.

The individual drivers are here

https://www.dell.com/support/home/en-us/product-support/product/optiplex-755/drivers

The AMT HECI SOL drivers and Audio Drivers etc are VISTA 32 or 64 and will work with 10.

There are no issues clean installing windows 10 on the 755.  There are specific Legacy Driver requirements.  Windows 10 works with Optiplex GX620, 745, 755, 760, 780, 960, 980, 990 etc.

http://downloads.dell.com/published/pages/optiplex-755.html

 

I also have no issues with upgrade install from previous versions 1511 or 1607.   Clean install from Known good media is more stable however.   Bios should be updated to latest for best results.  That may require reinstall of XP temporarily to get up to A22.  You must update in stages you cant jump from A00 to A22 in 1 step.

https://downloads.dell.com/FOLDER01133147M/1/O755-A22.exe

 

9/7/2007  9:11 AM      2074224 o755-a01.exe
 10/9/2007  1:20 PM      2075454 o755-a03.exe
 11/6/2007  3:14 PM      2120223 o755-a04.exe
 2/21/2008 10:31 PM      2129305 o755-a08.exe
 3/27/2008  1:02 AM      2128247 o755-a09.exe
 6/20/2008 10:57 AM      2230747 o755-a10.exe
 9/25/2008  9:30 PM      2245562 o755-a11.exe
 1/19/2009  3:50 AM      2218273 o755-a12.exe
  3/6/2009  5:01 AM      2220018 o755-a13.exe
 6/24/2009  4:59 AM      2220070 o755-a14.exe
 9/17/2009 10:58 PM      2223999 o755-a15.exe
 1/20/2010  4:49 PM      2226516 o755-a16.exe
  4/8/2010  3:09 AM      2229703 o755-a17.exe
 6/30/2011  3:50 AM      2227846 o755-a19.exe
10/26/2011  3:11 AM      2239507 o755-a20.exe

 

https://support.microsoft.com/en-us/help/4027322

 

If you have windows 10 download and create a Windows 10 1703 DVD and burn at 1X or 2X or 4X max speed and clean install.   Most of the hardware works out of the box but the chipset and intel RST and video cards like the Radeon 2400, 2600, 3400, 4600, etc are also legacy.   The AMD auto detect utility does not work with these legacy cards and the Audio Codec is not installed automatically.

Directx June 2010 is a must.

https://www.microsoft.com/en-us/download/details.aspx?id=8109

You download the file, extract into a folder, and run DXsetup.exe as administrator.

This is why you can now buy these models with Windows 10 Preinstalled.  OEM System Builder DVD versions of the software in 32 and 64 bit ARE available.  You need at least Pentium D 900 series like the 915 or better in order to install 64 bit windows 8.1 or 10.

Pentium D 800 series works fine with 32 bit version of windows 10.

https://www.amazon.com/Microsoft-Windows-Pro-Flash-Drive/dp/B01019TDJ8

I tell my clients these are Free computers because the retail cost of windows home is $119 and PRO is FQC-08788 $199.  I only recommend the TOWER version because they do not have proprietary power supplies and they are the most upgrade-able.

https://www.cdw.com/shop/products/Microsoft-Windows-10-Pro-Box-Pack-1-User/3797267.aspx

 

 

 

 

 

 

 

 

You could use a Dock to try and recover the files but at this point its not likely you will get much.  Not impossible but not inexpensive to recover the files.

https://www.amazon.com/WEme-Dual-Bay-External-Duplicator-Tool-Free/dp/B00PTUQE4M/

Ontrack Data Recovery could do it.  They recovered data from a hard drive that fell from the sky on the space shuttle colombia disaster.

https://www.ontrack.com/en-us/blog/kroll-ontrack-space-shuttle-columbia

$450 for diag and $4500 to recover files.  I have used them and they do a good job. They are not cheap however.

https://www.ontrack.com/en-us/data-recovery/mclean