[photoshop-beginners] troubles saving a file

Hello: I am trying to save a fairly large file as a .jpg. I keep getting the following message..."could not save a copy (file name) because of a program error." I'm using PS 7 and have saved very large files in the past with no issues. I can save smaller files. The photo is a 22 x 36 with a resolution of 300 p/i. Hope someone can give me some advice. It will save as a TIFF but most printers need a JPG. Also, what are some of the on-line photo printers/labs y'all use? Thanks for any and all assistance! Gary



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