this is da wayy...
1)i prefer u buy da dvd/cd.....dont care either it ori or fake.....just copy all items/folder..etc in the 1st disc...n make new folder in ur desktop n paste in it.....
2)then copy all the items/folder..etc in the 2nd disc...n paste in the same folder on ur desktop...(if it ask for want to merge or replace or keep the same folder(2),1st choose merge n 2nd take keep the same folder(2))(at this part i'm not realy remember...u just do what u can....;pp sory)
3)but before that delet all ur devil may cry 4 in ur program file (C)...
4)then instal new devil may cry 4 from the new folder on ur desktop that u paste on it(after copy from the disc,take out the disc)new installation may no need the disc....
5)n then finished install......open the folder on ur desktop again,n open the 'crack' folder....copy the 'devilmaycry4_dx9 n dx10'....
6)open ur hard disk(C) from ur 'My Computer' n search for 'CAPCOM' folder....open it n now open the 'DevilMayCry4' folder....paste the crack file that u copy n chose merge....
7)for those who make this stupid fuckin game hard to install like shitt......WALLAHH!!!!....now u can playy.....;DDD......