went from enterprise to ultimate

for about 2 months my wife and I where running vista enterprise and

loved it, but it was only the 90 day trial. I finally installed my

ultimate "clean install" on both pc's my wife and I have the same pc's

w/ 3.46 pentium 2gig memory and 80 gig HD and I notice the ultimate is

running slower than the enterprise. is there anything that you guys can

think of for me to check to speed it up? I ran my regcure, regvac and

system mechanic 7 and we both notice slowness, when opening programs,

installing or just starting up and it my startup I only have the

following. win defender, avg pro 7.5, sidebare and logmein.