0K lobby will not start

evry time i try to start zk lobby it gives me this error

PLATFORM VERSION INFO
Windows : 5.1.2600.196608 (Win32NT)
Common Language Runtime : 4.0.30319.239
System.Deployment.dll : 4.0.30319.1 (RTMRel.030319-0100)
clr.dll : 4.0.30319.239 (RTMGDR.030319-2300)
dfdll.dll : 4.0.30319.1 (RTMRel.030319-0100)
dfshim.dll : 4.0.31106.0 (Main.031106-0000)

SOURCES
Deployment url : file:///C:/Documents%20and%20Settings/pholden/Desktop/Zero-K.appref-ms%7C
Server : Microsoft-IIS/7.5
X-Powered-By : ASP.NET
Deployment Provider url : http://zero-k.info/lobby/Zero-K.application
Application url : http://zero-k.info/lobby/Application%20Files/Zero-K_2_38_0_0/Zero-K.exe.manifest
Server : Microsoft-IIS/7.5
X-Powered-By : ASP.NET

IDENTITIES
Application Identity : Zero-K.exe, Version=2.38.0.0, Culture=neutral, PublicKeyToken=0000000000000000, processorArchitecture=x86, type=win32

ERROR SUMMARY
Below is a summary of the errors, details of these errors are listed later in the log.

• Activation of C:\Documents and Settings\pholden\Desktop\Zero-K.appref-ms| resulted in exception. Following failure messages were detected:

+ An application for this deployment is already installed with a different application identity.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.

WARNINGS

• The manifest for this application does not have a signature. Signature validation will be ignored.
• The manifest for this application does not have a signature. Signature validation will be ignored.

OPERATION PROGRESS STATUS

• [3/13/2012 1:07:01 PM] : Activation of C:\Documents and Settings\pholden\Desktop\Zero-K.appref-ms| has started.
• [3/13/2012 1:07:03 PM] : Performing necessary update check as specified by the deployment.
• [3/13/2012 1:07:07 PM] : Consuming new update.
• [3/13/2012 1:07:07 PM] : Installation of the application has started.
• [3/13/2012 1:07:07 PM] : Processing of application manifest has successfully completed.
• [3/13/2012 1:07:07 PM] : Found compatible runtime version 4.0.30319.
• [3/13/2012 1:07:08 PM] : Request of trust and detection of platform is complete.

ERROR DETAILS
Following errors were detected during this operation.

• [3/13/2012 1:07:08 PM] System.Deployment.Application.DeploymentException (Subscription)

- An application for this deployment is already installed with a different application identity.
- Source: System.Deployment
- Stack trace:
at System.Deployment.Application.SubscriptionStore.CheckAndReferenceApplication(SubscriptionState subState, DefinitionAppId appId, Int64 transactionId)
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.ConsumeUpdatedDeployment(SubscriptionState& subState, ActivationDescription actDesc)
at System.Deployment.Application.ApplicationActivator.PerformDeploymentUpdate(SubscriptionState& subState, String& errorPageUrl)
at System.Deployment.Application.ApplicationActivator.ProcessOrFollowShortcut(String shortcutFile, String& errorPageUrl, TempFile& deployFile)
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.

does anyone have any ideas on why?