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HI CadillacPat

Tom is correct about the error message.  It is indicating you have insufficient RAM which as stated on your system is 8G.   Your Hp Envy 750-111 can be upgraded to 16G according to the HP specifications I copy and pasted below.

My standard recommendation these days when PS is used is 16G as the baseline as it is too easy to run out of memory or hit major slowdowns.  Best solution is to get the 16G RAM in place as first order of business.  You will be highly disappointed if you try and solve your problem by splitting or adding  a disk HD.

The memory used is a function of both the size of the project (images) which are loaded in all tabs as well as other programs/data you have running simultaneously.  I typically have LR and PS running and when I used to have 8G, I would always run into problems or even with just PS open if I had too many files open or just a small number of large files.

BTW - Whoever is giving you advice (assuming you shared the same info) to split the disk, that to me is a really big red flag that you should question their advice and judgement.  It just does not make sense given what you have posted in this thread.  Just saying.

Hope the extra details help and here is the info from HP:

John W/heeler

 Memory upgrade information  

•                Dual channel memory architecture
•               Two 240-pin DDR3 DIMM sockets
• Supports the following:
  • PC3-12800 (DDR3-1600)
  • PC3-10600 (DDR3-1333)
   
•               Supports 1 GB, 2 GB, 4 GB and 8 GB DIMMs
•               Supports up to 4 GB on 32-bit systems

  note:
  
  32-bit systems cannot address a full 4.0 GB of memory.
  

•               Supports up to 16 GB (unbuffered) on 64-bit computers

  note:
  
  Maximum memory shown reflects the capability of the hardware and can be limited further in the operating system.