If you need to find out when Windows last rebooted, due to Windows Updates etc, open a Command Prompt, and issue:
systeminfo
A sample of the output is as follows:
C:\Users\sburke>systeminfo Host Name: SSITECH OS Name: Microsoft Windows 7 Professional OS Version: 6.1.7601 Service Pack 1 Build 7601 OS Manufacturer: Microsoft Corporation OS Configuration: Standalone Workstation OS Build Type: Multiprocessor Free Registered Owner: sburke Registered Organization: Product ID: 00xxx-OEM-xxxxx Original Install Date: 13/10/2011, 16:51:59 System Boot Time: 14/03/2012, 09:03:02 System Manufacturer: Dell Inc. System Model: Precision M65 System Type: x64-based PC Processor(s): 1 Processor(s) Installed. [01]: Intel64 Family 6 Model 30 Stepping 5 GenuineIntel ~1728 Mhz BIOS Version: Dell Inc. A07, 25/09/2011 Windows Directory: C:\Windows System Directory: C:\Windows\system32 Boot Device: \Device\HarddiskVolume2 System Locale: en-ie;English (Ireland) Input Locale: en-ie;English (Ireland) Time Zone: (UTC) Dublin, Edinburgh, Lisbon, London Total Physical Memory: 8,116 MB Available Physical Memory: 5,579 MB Virtual Memory: Max Size: 16,231 MB Virtual Memory: Available: 13,342 MB Virtual Memory: In Use: 2,889 MB Page File Location(s): C:\pagefile.sys Domain: WORKGROUP Logon Server: \\PC-Name Hotfix(s): 77 Hotfix(s) Installed. [01]: 982861 [02]: KB971033