The client is using Windows XP. I've tried disabling their antivirus & firewall but it still doesn't work. The exception is DeploymentDownloadException. It appears to timeout while downloading a particular .dll.deploy file. I've pasted the detail error below:

PLATFORM VERSION INFO
Windows : 5.1.2600.196608 (Win32NT)
Common Language Runtime : 2.0.50727.3082
System.Deployment.dll : 2.0.50727.3053 (netfxsp.050727-3000)
mscorwks.dll : 2.0.50727.3082 (QFE.050727-3000)
dfdll.dll : 2.0.50727.3053 (netfxsp.050727-3000)
dfshim.dll : 2.0.50727.3053 (netfxsp.050727-3000)

SOURCES
Deployment url: http://www.cogentdatasystems.com/mercerbop/mercerbop.application?mid=520&t=cf500de7-6214-4062-9d30-3b9ade76d495&e=bobt@coastalvalley.com
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Application url: http://www.cogentdatasystems.com/mercerbop/MercerBOP_1_0_2_4/MercerBOP.exe.manifest
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET

IDENTITIES
Deployment Identity: MercerBOP.application, Version=1.0.2.4, Culture=neutral, PublicKeyToken=4e2ed212e51acb69, processorArchitecture=msil
Application Identity: MercerBOP.exe, Version=1.0.2.4, Culture=neutral, PublicKeyToken=4e2ed212e51acb69, processorArchitecture=msil, type=win32

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.cogentdatasystems.com/mercerbop/mercerbop.application?mid=520&t=cf500de7-6214-4062-9d30-3b9ade76d495&e=bobt@coastalvalley.com resulted in exception. Following failure messages were detected:
+ Downloading http://www.cogentdatasystems.com/mercerbop/MercerBOP_1_0_2_4/PdfSharp.dll.deploy did not succeed.
+ The operation has timed out.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.

WARNINGS
There were no warnings during this operation.

OPERATION PROGRESS STATUS
* [4/13/2009 10:42:11 AM] : Activation of http://www.cogentdatasystems.com/mercerbop/mercerbop.application?mid=520&t=cf500de7-6214-4062-9d30-3b9ade76d495&e=bobt@coastalvalley.com has started.
* [4/13/2009 10:42:12 AM] : Processing of deployment manifest has successfully completed.
* [4/13/2009 10:42:12 AM] : Installation of the application has started.
* [4/13/2009 10:42:12 AM] : Processing of application manifest has successfully completed.
* [4/13/2009 10:42:13 AM] : Request of trust and detection of platform is complete.

ERROR DETAILS
Following errors were detected during this operation.
* [4/13/2009 10:47:25 AM] System.Deployment.Application.DeploymentDownloadException (Unknown subtype)
- Downloading http://www.cogentdatasystems.com/mercerbop/MercerBOP_1_0_2_4/PdfSharp.dll.deploy did not succeed.
- Source: System.Deployment
- Stack trace:
at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)
at System.Deployment.Application.SystemNetDownloader.DownloadAllFiles()
at System.Deployment.Application.FileDownloader.Download(SubscriptionState subState)
at System.Deployment.Application.DownloadManager.DownloadDependencies(SubscriptionState subState, AssemblyManifest deployManifest, AssemblyManifest appManifest, Uri sourceUriBase, String targetDirectory, String group, IDownloadNotification notification, DownloadOptions options)
at System.Deployment.Application.ApplicationActivator.DownloadApplication(SubscriptionState subState, ActivationDescription actDesc, Int64 transactionId, TempDirectory& downloadTemp)
at System.Deployment.Application.ApplicationActivator.InstallApplication(SubscriptionState& subState, ActivationDescription actDesc)
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)
--- Inner Exception ---
System.Net.WebException
- The operation has timed out.
- Source: System
- Stack trace:
at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)

COMPONENT STORE TRANSACTION DETAILS
No transaction information is available.

The file is on the server. I tried downloading it to the clients machine and it downloads about 225k of 480k and the download hangs. I'm sure if I waited long enough it would have given some kind of time out message.