I cant get any hacks to work

I have Win XP and I try to use the hacks and cant seen to get then to work. I start with Harolds bypass 2.5 and then i try to use 7usabballs opk hack and doesent work. I must just be a noob

Try an easy hack one like chams or something that works without effort with the bypass. There are many tutorials on how to work the hacks make sure to do it right.