New
#11
It will default to Aero off if it can't run it, otherwise about all the Services that can be shut off (that aren't already on fast trigger manual) are Tablet PC and Offline Files, maybe Defender tho it is worth its weight.
You can regain some performance by editing the graphics effects as suggested, turning off Indexing and running a lightweight AV like Avast free home with only Defender and Firewall.
I tried vLiting Ult down to half the size and found it made no difference except size. It pretty much adapts to the hardware until you get below 1ghz which it will reject and 528mb which will hobble it some.