Attempting to install Vista SP1 (both from download to my computer and from windows update) - same result - 800F081F. I have installed KB 947821 - and the results follow. Any help would be appreciated. Thanks. ================================= Checking System Update Readiness.Version 6.0.6000.22008-06-03 10:30:40 AM Checking Deployment Packages Checking Package Manifests and catalogs. Checking package watchlist. Checking component watchlist. Checking packages.Checking component registry Checking component store(f)Corrupt ManifestCSI0x00000000\winsxs\Manifests\x86_135a9c42e7b84b649b9a15dbd3ab845d_31bf3856ad364e35_6.0.6000.20734_none_ff4d894e26950ce5.manifest135a9c42e7b84b649b9a15dbd3ab845d, Culture=neutral, Version=6.0.6000.20734, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=x86, versionScope=NonSxSManifest: Empty file(f)Missing Payload FileCSI0x00000003\winsxs\x86_usbport.inf.resources_31bf3856ad364e35_6.0.6000.16609_en-us_ec2f879da9a8515c\usbport.inf_locusbport.inf.Resources, Culture=en-US, Version=6.0.6000.16609, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=x86, versionScope=NonSxS(f)Corrupt ManifestCSI0x00000000\winsxs\Manifests\x86_usbport.inf.resources_31bf3856ad364e35_6.0.6000.16609_es-es_ebfae481a9cf4301.manifestusbport.inf.Resources, Culture=es-ES, Version=6.0.6000.16609, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=x86, versionScope=NonSxSManifest: Empty file(f)Missing Payload FileCSI0x00000003\winsxs\x86_usbport.inf.resources_31bf3856ad364e35_6.0.6000.20734_en-us_ec93b332c2e2c646\usbport.inf_locusbport.inf.Resources, Culture=en-US, Version=6.0.6000.20734, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=x86, versionScope=NonSxS(f)Corrupt ManifestCSI0x00000000\winsxs\Manifests\x86_usbport.inf.resources_31bf3856ad364e35_6.0.6000.20734_es-es_ec5f1016c309b7eb.manifestusbport.inf.Resources, Culture=es-ES, Version=6.0.6000.20734, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=x86, versionScope=NonSxSManifest: Empty file Scanned 10907 components, 13375 component payload filesSummary:Milliseconds: 633800Found 5 errors CSI Corrupt Manifest Total Count: 3 CSI Missing Payload File Total Count: 2Customer Experience report successfuly uploaded. Thank you for participating. For more information, see the Microsoft Customer Experience Improvement Program on the Microsoft web site.

Hi, The report indicates that there are some system files corrupted. First, I suggest performing a clean boot to narrow down the issue: How to troubleshoot a problem by performing a clean boot in Windows Vista http://support.microsoft.com/kb/929135 After that, please try to install the SP1 and check the result. If the issue persists, please refer to the following KB article to troubleshoot the issue: Some Windows Vista functions may not work, or Windows Vista may stop responding http://support.microsoft.com/kb/929833 Hope it helps.