Class not registered...

the same program that i used to install some times.
After installing SP4 shows me the message :

Run-time error '-2147221164(80040154)'
Class not registered...

when i install on a new machine but if i install the vb on this machine the program works....

Did you packaged all DLL's and OCX's ?
review the files you shipped, make sure it contains all runtime files and other Depencies