Corel Draw Runtime Error!

I've problem with Corel Photo Paint. After i taked a virus the program give me this kind of error message and close; i checked out the register but almost all is good to me. The only thing that missed is the file msi....that should be in the windows\installer foler; this is absent, maybe it was erased from my Antivirus.

 

How i can fix it? I tried to push F8 to restore the default setting, but nothing

I've the old CD...but now it's unreadable