New Post: Change Target Install Directory

Hi! I am using WIX# to create MSI for my project. I set the Install Dir in my code as new Dir(@"inetpub\wwwroot", getDirStructure()),. It is installing the setup files to C:\ drive in Dev environment as there is no other disc available but in the Test environment it is installing the setup files to D:\ drive which is creating issue for me. I tried adding the InstallDir as new Dir(@"C:\inetpub\wwwroot", getDirStructure()),but it gave error whilw building the code as the character ":" not allowed. Please suggest how to fix this. How i can set the default Install Dir to "C:\" drive.

Thanks in advance.