We're running SQL 2005 on Win2K3 server and are using SSRS.  Here's the situation:
I can run Report Builder from localhost
My coworker can run Report Builder on his Vista computer
Another coworker can run Report Builder on his XP SP3 computer (IE7)
I can NOT run Report Builder on my XP SP3 computer (IE7)
I'm told that it could be anything from an errant registry entry to a group policy problem.  Here is what I've tried:
Put the site into "Trusted Sites" with "low" security
re-install .NET
create a new local user account and attempt to run it
The results? Every single time, I get a dialog box:  "Application cannot be started. Contact the application vendor"
I click the details button and get this:
PLATFORM VERSION INFO
 Windows    : 5.1.2600.196608 (Win32NT)
 Common Language Runtime  : 2.0.50727.3607
 System.Deployment.dll   : 2.0.50727.3053 (netfxsp.050727-3000)
 mscorwks.dll    : 2.0.50727.3607 (GDR.050727-3600)
 dfdll.dll    : 2.0.50727.3053 (netfxsp.050727-3000)
 dfshim.dll    : 2.0.50727.3053 (netfxsp.050727-3000)
SOURCES
 Deployment url   : http://www.example.com/ReportServer/ReportBuilder/ReportBuilder.application
      Server  : Microsoft-IIS/6.0
      X-Powered-By : ASP.NET
      X-AspNet-Version: 2.0.50727
IDENTITIES
 Deployment Identity  : ReportBuilder.application, Version=9.0.3042.0, Culture=neutral, PublicKeyToken=c3bce3770c238a49, processorArchitecture=msil
APPLICATION SUMMARY
 * Online only application.
 * Trust url parameter is set.
ERROR SUMMARY
 Below is a summary of the errors, details of these errors are listed later in the log.
 * Activation of http://www.example.com/ReportServer/ReportBuilder/ReportBuilder.application resulted in exception. Following failure messages were detected:
  + Value does not fall within the expected range.
COMPONENT STORE TRANSACTION FAILURE SUMMARY
 No transaction error was detected.
WARNINGS
 There were no warnings during this operation.
OPERATION PROGRESS STATUS
 * [4/7/2010 2:53:57 PM] : Activation of http://www.example.com/ReportServer/ReportBuilder/ReportBuilder.application has started.
 * [4/7/2010 2:53:58 PM] : Processing of deployment manifest has successfully completed.
ERROR DETAILS
 Following errors were detected during this operation.
 * [4/7/2010 2:53:58 PM] System.ArgumentException
  - Value does not fall within the expected range.
  - Source: System.Deployment
  - Stack trace:
   at System.Deployment.Application.NativeMethods.CorLaunchApplication(UInt32 hostType, String applicationFullName, Int32 manifestPathsCount, String[] manifestPaths, Int32 activationDataCount, String[] activationData, PROCESS_INFORMATION processInformation)
   at System.Deployment.Application.ComponentStore.ActivateApplication(DefinitionAppId appId, String activationParameter, Boolean useActivationParameter)
   at System.Deployment.Application.SubscriptionStore.ActivateApplication(DefinitionAppId appId, String activationParameter, Boolean useActivationParameter)
   at System.Deployment.Application.ApplicationActivator.Activate(DefinitionAppId appId, AssemblyManifest appManifest, String activationParameter, Boolean useActivationParameter)
   at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
   at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
COMPONENT STORE TRANSACTION DETAILS
 * Transaction at [4/7/2010 2:53:58 PM]
  + System.Deployment.Internal.Isolation.StoreOperationSetDeploymentMetadata
   - Status: Set
   - HRESULT: 0x0
  + System.Deployment.Internal.Isolation.StoreTransactionOperationType (27)
   - HRESULT: 0x0
I'm really at a loss.  I'm certain there is something on my PC preventing the application from running - but I just don't know what.  Google hasn't been much of a help because most problems are related to the server configuration (which I know is correct since it works on other PCs)
Help me, Overflow Kenobi, you're my only hope..