The file [advapi32.dll], is NOT a valid CLR type.

Hi,
My Windows Vista has encounter the following problem. I have no idea on it. I have installed Vista six months back to my present machine. After installation no serious problem was occur. But recently the following malfunction is happening. If you know the solution please let me know.
Error
The file [advapi32.dll], is NOT a valid CLR type.
Thanks,
Rinku
