Is ultravnc 1.10.24 (or some other numbers) a virus?

at first i thought it was a virus i made a copy of ultimate boot cd then i found it in the folder after i had already made 2 isos. so i scan the isos(that were already on the cd)and while it was scanning i saw a folder called ultravnc but i didnt c any ultravnc files and the two ativiruses i scanned the iso with didnt find anything(malware bytes,comcast anti spyware). ok so i deleted the folder ultravnc virus was found in(on my c: not the iso) and then later i found it again in my system volume folder. so i guess ultimate boot iso dosnt have a virus or does it.by the way there was virus that redirected me 2 freeze.com(on a totally different computer i was fixing) ok i know this is a virus site so i close the mozilla firfox browser and scanned using bootable isos so i got rid of alot of fake alerts and stuff(which i found strange since no fake alerts were popping up when i was on). Then it stopped redirecting me and just as a precaution i uninstalled mozilla firefox then reinstalled(because freeze.com was a toolbar i figured out). Then it said disabled in add ons menu and said it was compataible with the new mozilla and it also dosnt have a remove button next to its name like other add ons. Could it already be gone from the virus scans or is it still a toolbar and if so how do i go about getting rid of the toolbar.