Why am I being asked to activate a 2 year old installation of Windows?

My laptop is a Compaq Presario CQ61 and I'm running Windows Vista 32-bit service pack 2. I've had it for over two years. I turned it on today and it's asking me to activate Windows. I have no idea why it's doing this. It is a legitimate copy bought and activated two years ago.When I go to Control PanelSystem and MaintenanceSystem, under the Windows Activation section I have the message:"You must activate today. Activate Windows now"Product ID: XXXXX-XXX-XXXXXXX-XXXXX "Change product key"Apparently my product key is invalid, but as I've mentioned, I've been using it for nearly two years.This is an urgent issue as I'm currently abroad and require my laptop to organize flight details back home in a week. Any speedy assistance would be much appreciated.Microsoft Genuine Advantage Diagnostic Tool output:Diagnostic Report (1.9.0027.0):-----------------------------------------Windows Validation Data-->Validation Status: GenuineValidation Code: 0Cached Online Validation Code: N/A, hr = 0xc004f012Windows Product Key: *****-*****-Y2QYV-DJ8W3-749T4Windows Product Key Hash: JCyoK5+4wrzubemFqCsOJCkCjTA=Windows Product ID: 89572-OEM-7236386-91449Windows Product ID Type: 8Windows License Type: COA SLPWindows OS version: 6.0.6002.2.00010300.2.0.002ID: {3A06CD88-04F4-485B-BC9E-718B6A5EF56F}(1)Is Admin: YesTestCab: 0x0LegitcheckControl ActiveX: N/A, hr = 0x80070002Signed By: N/A, hr = 0x80070002Product Name: Windows Vista ™ Home BasicArchitecture: 0x00000000Build lab: 6002.vistasp2_gdr.120402-0336TTS Error: Validation Diagnostic: Resolution Status: N/AVista WgaER Data-->ThreatID(s): N/A, hr = 0x80070002Version: N/A, hr = 0x80070002Windows XP Notifications Data-->Cached Result: N/A, hr = 0x80070002File Exists: NoVersion: N/A, hr = 0x80070002WgaTray.exe Signed By: N/A, hr = 0x80070002WgaLogon.dll Signed By: N/A, hr = 0x80070002OGA Notifications Data-->Cached Result: N/A, hr = 0x80070002Version: 2.0.48.0OGAExec.exe Signed By: MicrosoftOGAAddin.dll Signed By: MicrosoftOGA Data-->Office Status: 100 GenuineMicrosoft Office Home and Student 2007 - 100 GenuineOGA Version: Registered, 2.0.48.0Signed By: MicrosoftOffice Diagnostics: 025D1FF3-364-80041010_025D1FF3-229-80041010_025D1FF3-230-1_025D1FF3-517-80040154_025D1FF3-237-80040154_025D1FF3-238-2_025D1FF3-244-80070002_025D1FF3-258-3_E2AD56EA-765-d003_E2AD56EA-766-0_E2AD56EA-134-80004005Browser Data-->Proxy settings: N/AUser Agent: Mozilla/4.0 (compatible MSIE 8.0 Win32)Default Browser: C:Program FilesInternet Exploreriexplore.exeDownload signed ActiveX controls: PromptDownload unsigned ActiveX controls: DisabledRun ActiveX controls and plug-ins: AllowedInitialize and script ActiveX controls not marked as safe: DisabledAllow scripting of Internet Explorer Webbrowser control: DisabledActive scripting: AllowedScript ActiveX controls marked as safe for scripting: AllowedFile Scan Data-->Other data-->Office Details: {3A06CD88-04F4-485B-BC9E-718B6A5EF56F}1.9.0027.06.0.6002.2.00010300.2.0.002x32*****-*****-*****-*****-749T489572-OEM-7236386-914498S-1-5-21-2720355562-718120544-2691774524Hewlett-PackardSLIC-MPCHewlett-PackardF.0220090316000000.000000+00001303507018400F808090409SE Asia Standard Time(GMT+07:00)03HPQOEMSLIC-MPC100100Microsoft Office Home and Student 2007125CE2BDBED489F0CCR0A/aGjBoM8X25bdzhcEmoD+Ww=81602-902-4416695-681101 Spsys.log Content: 0x80070002Licensing Data-->Software licensing service version: 6.0.6002.18005Name: Windows™ Vista, HomeBasic editionDescription: Windows Operating System - Vista, OEM_COA_SLP channelActivation ID: 91dbad68-4713-4f9c-b351-6e77a8361741Application ID: 55c92734-d682-4d71-983e-d6ec3f16059fExtended PID: 89572-00144-363-891449-02-2057-6002.0000-1532012Installation ID: 001836301832121251725440964132635350610056074891664680Processor Certificate URL: http://go.microsoft.com/fwlink/?LinkID=43473Machine Certificate URL: http://go.microsoft.com/fwlink/?LinkID=43474Use License URL: http://go.microsoft.com/fwlink/?LinkID=43476Product Key Certificate URL: http://go.microsoft.com/fwlink/?LinkID=43475Partial Product Key: 749T4License Status: LicensedWindows Activation Technologies-->N/AHWID Data-->HWID Hash Current: NAAAAAEAAgABAAIAAQABAAAAAwABAAEAeqjuyTbovOx6f0AU9mXWFfL0+H6w9s5lrFZGyg==OEM Activation 1.0 Data-->N/AOEM Activation 2.0 Data-->BIOS valid for OA 2.0: no, invalid SLIC tableWindows marker version: N/AOEMID and OEMTableID Consistent: N/ABIOS Information: ACPI Table Name OEMID Value OEMTableID Value APIC HPQOEM SLIC-MPC FACP HPQOEM SLIC-MPC HPET HPQOEM SLIC-MPC BOOT HPQOEM SLIC-MPC MCFG HPQOEM SLIC-MPC ASF! HPQOEM SLIC-MPC SLIC HPQOEM SLIC-MPC SSDT PmRef CpuPm

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