TuneUp is a really nice software lol...
try it..
it can
1.defrag
2.remove register files
3.remove programs
4.optimize comp/internet
5.style ur comp
6.search back ur deleted files
7.memory optimizer

im currently using 2006..
oh yea
if u reach the 30day trial jus format ur comp and u can use it again...
coz i duno which reg file to del lol