As is shown on our
free hosting comparison page, ASP.NET is disabled on Free Hosting accounts. This is due to server configuration issues with cPanel, and there is currently no ETA for when a fix can be applied. If you can wait, it will eventually be enabled again, but in the meantime you should consider purchasing either Illuminated or Premium hosting, which have ASP.NET (Illuminated is only $1/month, which is really cheap!)