Really need help with these 2 DC games-Someone please respond

I'm having having a huge problem with PSO and Sega Smash pack. I keep getting errors while extracting it. I have all the rar's for Pso like 24 or so of them but when i extract the file it's corrupt it only does like 11 rars not the whole thing and then if i get it to work somehow it's 791mb in size and can't burn it to any kind of cd. Does anyone have any clue. Also Sega Smash Pack extracts but at the end it says File is corrupt and i can't burn it. Anyone know what to do