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DaveHayler -SSE2 is a processor attribute - nothing to do with Linux per-se. Wikipedia has a good article on SSE that lists the processor architectures that support SSE2 - which is pretty much all those made in this century.
I'd be mighty surprised if the Acer Aspire 7520 processor (I think its an AMD Turion 64 X2) didn't have SSE2.
Given what other's have said about slitaz being targeted at small systems (i486/196MB), and the specs of the Acer Aspire 7520, and that you're just starting out with linux I wonder if it might be better for you to use one of the more popular linux distro's.
You might also be interested to read what Kovid Goyal (author of calibre) wrote recently about Linux
Linux definitely has more problems than any other OS
BR