Installing CR 2008 SP3

Hi,

I got an error today when starting CR 2008 SP2: a pvlocal.dll is missing.

So I downloaded the latest SP3 and tried to install it, but I got errors saying that the dlls failed to register, error 1904

How can I solve this. CR has been workgin as SP1 and SP2 for more nearly 2 years, and I do not understand what has happened.

Thankfull for all help!

Per-Olof