DSP Builder to ModelSim

Btw, have you tried compiling your DSP Builder design in Signal Compiler yet? Judging from the error statement, there is a chance that your IP cache folder got corrupted (it happens from time to time, especially when you migrate from one version of DSP Builder to another)...

I would suggest the following:

1. Delete the existing IP cache folder(s) in your computer... Go to C:\Documents and Settings\<User Name>\

--> Inside that folder, you should see a .altera.quartus folder

2. Delete that folder and restart your DSP Builder... see if you still see the same error...

Best of luck.