How to install a 32-bit version of SQL Server 2005 Reporting Services on a computer that is running a 64-bit version of Windows

Install the 32-bit version of Reporting Services on a computer that is running the 64-bit version of IIS 7.0

1. Enable ASP.NET and IIS before you install Reporting Services.
2. Open a command prompt. To do this, click Start, point to All Programs, point to Accessories, right-click Command Prompt, and then clickRun as administrator.
3. In the User Account Control dialog box, click Continue.
4. Set the Enable32bitAppOnWin64 option to True at the Parent level under the master Web site level. To do this, follow these steps:
   1. In IIS Manager, click Application Pools.
   2. In the Actions pane, click Set Application Pool Defaults.
   3. In the General section, set the Enable32bitAppOnWin64 option to True.
   Note By default, a SQL Server 2005 64-bit installer will look for a 64-bit IIS installation. If the Enable32bitAppOnWin64 option is set toFalse at the root level, then the installation of Reporting Services should complete successfully.
5. Install the 32-bit version of Reporting Services. You must apply SQL Server 2005 Service Pack 2 (SP2) after you install Reporting Services in Windows Vista. If you install SQL Server 2005 Express Edition with Advanced Services, you can run SQL Server 2005 Express Edition with Advanced Services SP2. 
   
   For more information, visit the following Microsoft Web site:
   http://go.microsoft.com/fwlink/?LinkID=63922

   (http://go.microsoft.com/fwlink/?LinkID=63922)
   If errors occur during setup, see the "Troubleshoot setup errors on Windows Vista" section.
6. Reset IIS.
7. Configure the report server for local administration. To access the report server and Report Manager locally, follow these steps:
   1. Start Microsoft Internet Explorer.
   2. On the Tools menu, click Internet Options.
   3. Click Security.
   4. Click Trusted Sites.
   5. Click Sites.
   6. Under Add this website to the zone, type http://servername.
   7. If you are not using HTTPS for the default site, click to clear the Require server certification (https:) for all sites in this zone check box.
   8. Click Add.
   9. Repeat steps f and g to add http://localhost, and then click Close.
      
      This step lets you start Internet Explorer either to localhost or to the network computer name of the server for both Report Server and Report Manager.
8. Create role assignments that explicitly grant you full-permissions access. To do this, follow these steps:
   1. Start Internet Explorer by using the Run as administrator option. To do this, click Start, click All Programs, right-click Internet Explorer, and then click Run as administrator.
   2. Start Report Manager. 
      
      Note By default, the Report Manager URL is http://servername/reports. If you are using SQL Server 2005 Express Edition with Advanced Services SP2, the Report Manager URL is http://servername/reports$sqlexpress. If you are using a named instance of Reporting Services, the Report Manager URL is http://servername/reports$InstanceName.
   3. On the Home page, click Properties.
   4. Click New Role Assignment.
   5. Type a Windows user account in the following format:
      domain\user
   6. Click to select the Content Manager check box.
   7. Click OK.
   8. In the upper-right corner of the Home page, click Site Settings.
   9. Click Configure site-wide security.
   10. Click New Role Assignment.
   11. Type a Windows user account in the following format:
       domain\user
   12. Click to select the System Administrator check box.
   13. Click OK.
   14. Close Report Manager.
9. Open Report Manager in Internet Explorer without using the Run as administrator option.

相关链接：
如何安装以及如何在运行 Windows Server 2008 的计算机上配置 SQL Server 2005 报告服务http://support.microsoft.com/kb/938245/zh-cn 
在Windows2008 64位下安装SQL Server 2005 和RS：http://wenku.baidu.com/view/cf330e205901020207409cf7.html
Windows 2008 x64 上安装SQL 2005 x64报表服务：http://wenku.baidu.com/view/b99b04106c175f0e7cd13712.html