How to get rid of registry changes made by a trail software

well what ever u do one change will stay there in place to make sure that, u dont install it againg to keep continu the trial once again...

if u try to do so, it would be illegal... by the way, that problem are u facing ??

try Ccleaner... it takes care of most of the problem by removing junk data and entry...

ccleaner or any registry cleaner wont help...these days software makers add hidden acprotect, pcguard, armadillo, obsidium, svk, execryptor, softsentry, etc keys to ur registry....these r some sort of protection mechanisms, to put it simply...but yes there are ways...

there is a path to every destination.......learn to achieve it
it illegal to use trail s/w again
...but if u do not intend to use to it agian amd just wanna clear registry use any registry cleaning s/w

One more thing, some s/w which r 3-4 yrs old, depends on registry 2 determine the trial version. Now a days, s/w Engg. r so smart that they doesn't depends on a simple registry value to make trial version. So it's not possible to use a trial s/w again by cleaning its registry.