Pal to nstc /avi to dvd

hi, out there i have a two part problem #1 i got some info on pal to nstc, which icluded some programs one which had nero in it, i tried the nero 7 free try and it worked but it screwed up my computer. after the trial ran out i tried to remove it because i had a older free nero program. it gave me hell because the nero 7 would not let me use the other so i tried to remove all the nero programs to reinstall the frist now everytime i put in a dvd my power dvd will start up but a nero error shows up saying i needa fil advctr2.dll. even though i removed and tried clearing out all old files with a windows(safty. live.com ) clean up.also because i do love my movies i still need to find programs that can convert pal to nstc and avi to dvd can someone out there help me i am not a computer wiz but i am willing to try and learn if you have any good programs free hopefully tell me where to start i have a trial version of convertx to dvd which seems to work with avi but it can’t help with converting pal to nstc. any help will be welcomed

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