I'm having my curse client tell me that it's experienced an un-recoverable error. It then tells me to go to the microsoft site to download .net 3.5 sp1. I dl that and nothing seems to happen. I'm not sure if it has something to do with the .net or the client. If anyone knows what to do, please tell. Thanks.

PLATFORM VERSION INFO
    Windows             : 6.1.7100.0 (Win32NT)
    Common Language Runtime     : 2.0.50727.4927
    System.Deployment.dll         : 2.0.50727.4918 (NetFXspW7.050727-4900)
    mscorwks.dll             : 2.0.50727.4927 (NetFXspW7.050727-4900)
    dfdll.dll             : 2.0.50727.4918 (NetFXspW7.050727-4900)
    dfshim.dll             : 2.0.50727.4918 (NetFXspW7.050727-4900)

SOURCES
    Deployment url            : file:///C:/Users/Dan/Desktop/CurseClient.application

ERROR SUMMARY
    Below is a summary of the errors, details of these errors are listed later in the log.
    * Activation of C:\Users\Dan\Desktop\CurseClient.application resulted in exception. Following failure messages were detected:
        + The referenced assembly is not installed on your system. (Exception from HRESULT: 0x800736B3)

COMPONENT STORE TRANSACTION FAILURE SUMMARY
    No transaction error was detected.

WARNINGS
    There were no warnings during this operation.

OPERATION PROGRESS STATUS
    * [10/20/2009 6:05:52 PM] : Activation of C:\Users\Dan\Desktop\CurseClient.application has started.

ERROR DETAILS
    Following errors were detected during this operation.
    * [10/20/2009 6:05:52 PM] System.Runtime.InteropServices.COMException
        - The referenced assembly is not installed on your system. (Exception from HRESULT: 0x800736B3)
        - Source: System.Deployment
        - Stack trace:
            at System.Deployment.Internal.Isolation.IStore.GetAssemblyInformation(UInt32 Flags, IDefinitionIdentity DefinitionIdentity, Guid& riid)
            at System.Deployment.Application.ComponentStore.GetSubscriptionStateInternal(DefinitionIdentity subId)
            at System.Deployment.Application.SubscriptionStore.GetSubscriptionStateInternal(SubscriptionState subState)
            at System.Deployment.Application.SubscriptionState.Validate()
            at System.Deployment.Application.SubscriptionStore.CheckAndReferenceApplication(SubscriptionState subState, DefinitionAppId appId, Int64 transactionId)
            at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
            at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
            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
    No transaction information is available.

Do you do all your Windows updates, even the optional ones? For example, going to the http://microsoftupdate.com site and not just using Automatic Updates? In any case, I am moving this thread to the Bugs section.

Yeah, I do all my updating through windows update. I'll try the sit and see if that works. It usually tells me to go to the start > windows update. Curse client made my pc crash while I was updating my addons and when I restarted, I started getting the error messages about .net 3.5. Do you know how to un-install or re-install the beta Curse client and/or re-install un-install the .net 3.5? I can't seem to find either one of the programs in my add/remove programs in the control panel.

Weird, both the CC and .net35 show up in my Add/Remove. In any case, to reinstall v4 beta of the CC, just get it again from curseforge.com or wowace.com and the dotnet351 can be downloaded here.

Alright, I'll give it a try again when I get home. Thanks for the help.