geebalicous 0 Light Poster

i hav this error when trying to reinstall norton internet security i went to the website and found the solution but i dont know if this regedit n stuff will harm my PC can u plz chek it out http://service1.symantec.com/SUPPORT/sharedtech.nsf/0/b5bc48477b8d15c3652572d000684016?OpenDocument&seg=hm&lg=en&ct=aa