^ You got it right. All the 'disables' are to spare writings to the SSD, but this ain't so mission critical with today's SSDs, so if you're particularly fond of any of those services you may let them activated (except defrag, defragging SSDs is usually not a good idea). Correct partition alignment and manually TRIMming are more relevant. Under heavy SSD usage manually TRIMming more frequently would be better, say once per day. Under normal use once a week will be fine. Beware some SSD makers like Crucial don't bundle a software tool for manually TRIMming, make sure the SSD brand and model you get for XP/Vista comes with such a tool. Don't worry, lots of people succesfully run XP from a SSD. If you got a comp with Vista, first plug the SSD into that comp to partition/format it like any HDD. Unlike XP, from Vista onwards Windows aligns partitions correctly by default (see here). Once partitioned/formatted, then either unplug SSD from Vista comp, plug into XP comp and install XP normally (preserving the partition/s), or just paste on the SSD a system image of XP from HDD. XP will run from a SSD with non-optimal partition alignment, but reads/writes will be slower and you may experience occasional 'stuttering'. Another healthy trick for a SSD under XP, without native TRIM, would be some overprovisioning. When partitioning the SSD just leave some unpartitioned space as 'strategical reserve', say if the SSD is a 128GB one, partition just 100GB and leave the rest unpartitioned, blank, to help with SSD housekeeping (TLDR on overprovisioning SSDs).