error during installation of sql server 2005

I have sql server 2000 installed on my PC. Now it is giving following error during installation of sql server 2005.

"The procedure entry point _vswprintf_c_l could not be located in the dynamic link
library MSVCR80.dll."

What can be wrong?I would suggest posting this to SQL Server Setup & Upgrade forum for faster response.

Thanks,
-Vineet Rao