Unable to save file as PSD - PS says the file is over 2GB when it's not

i have psd i've been working on many months. week got new computer. when open file on new computer, unable save psd. file size, according windows explorer, 600mb. according ps cc's document size displayed @ bottom of document window, document size 288.4m / 1.77g. yet when try save file on new computer, error:

 

could not save "filename.psd" because document bigger 2 gigabytes.
see topic "saving files" more information.

 

i don't understand how i've been working on document last several months , never had problem saving it, yet on new computer, unable save. new computer has secondary ssd harddrive using primary scratch disk. new computer has more ram , better processor. had copied of preferences files old computer new, , don't see settings different between 2 computers. can please provide direction?

 

(note: i've been running ps cc x32 because x64 version isn't stable on computer.)

 

file size displayed in windows explorer: 600,941kb.

 

new: document size displayed in document window: 288.4m / 1.77g
old: document size displayed in document window: 288.4m / 1.77g

 

new: adobe photoshop version: 14.2 (14.2 20131211.r.515 2013/12/11:23:00:00) x32
old: adobe photoshop version: 14.1.2 (14.1.2 20130923.r.427 2013/09/23:23:00:00) x32

 

new: operating system: windows 7 64-bit
old: operating system: windows 7 64-bit

 

new: version: 6.1 service pack 1
old: version: 6.1 service pack 1

new: physical processor count: 4
old: physical processor count: 8

 

new: logical processor count: 8

 

new: processor speed: 3591 mhz
old: processor speed: 2394 mhz

 

new: built-in memory: 32694 mb
old: built-in memory: 30718 mb

 

new: free memory: 25810 mb
old: free memory: 25633 mb

 

new: memory available photoshop: 3255 mb
old: memory available photoshop: 3255 mb

 

new: memory used photoshop: 60 %
old: memory used photoshop: 69 %

 

new: image tile size: 128k
old: image tile size: 128k

 

new: image cache levels: 6
old: image cache levels: 6

 

new: scratch volume(s):
  c:\, 930.2g, 686.5g free
  b:\, 111.8g, 103.6g free
old: scratch volume(s):
  c:\, 930.7g, 567.1g free

photoshop not file editor save image file document.  can not show file sizes file not exist windows explorer not god there no psd file backing current document state made changes. photoshop message states if save current docment psd file exceed 2gb case must use large file format photoshop native file format psb.  size information photoshop shows not file size.  image file formats support compression.  file size unknown till document encoded particular file format.

 

did increase document size convert 16bit mode or  32bit mode use image size add layers etc.

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