cant re-install cubase 5

My hard drive crashed and I’m re-instalalling cubase 5…
i followed instructions and got the latest syncrosoft software but continue to get these messages:
File SYNSOACC.DDL could not be located in the windows system folders
File SYNSOACC.DDL does not have the expected interface.
I have my registered key but my license is’nt showing up on it…
i try to download licences with my registration code and get these same messages
help! i’m in the middle of production
I am on my pc using window xp
Thanx so much for any help
Nick Mostly

Try googling “File SYNSOACC.DDL could not be located in the windows system folders”

there seems to be a fair bit on this.