I have this same problem. After talking w/ my account rep, she sent me this info. I haven't tried it yet, but she assures me this is the solution.
Windows hosting accounts using IIS7 support the Microsoft® URL Rewrite Module, which rewrites complicated URLs into more user-friendly URLs based on rules specified by the webmaster in the account's web.config file.
NOTE: The Microsoft URL Rewrite Module is supported on Windows hosting plans running IIS7. To check which version you have, log in to your
Account Manager, click
Web Hosting in the Products section, and then click
Launch next to the account you want to use. Your IIS Version displays in the
Account Summary section.
For example, the Microsoft URL Rewrite Module could rewrite
For more information, see
Microsoft’s® URL Rewrite Module documentation.