Some questions:
1. what's the resolution of the .tif?
2. what's the bit depth per channel of the .tif? (I think DSS saves 16bit but the autosaves are 32bit)
3. what version of PS?
We used to have similar problems at work with loading files in old 32bit versions of PS on Mac (pre CS5). They would give out of memory errors when it was obvious there was plenty of free RAM. I don't think we ever found a solution but it doesn't happen on the newer 64bit version of PS (CS5> on Mac and CS4> on Win).
You could download gimp and convert the file to a different format (like a .tga, I've always found Adobe's tif support was a bit funky), I'd bet a dollar that gimp will open it fine ;-)
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