You should look through your event viewer to see if there is any indication of what might have been giving it trouble. If nothing else it might spare you a problem in the future.
If you choose to do so and find something post it here and I'll see if I can turn up anything.
There is a lot to look through but this seems to be about the time the trouble happened;
Log Name: Application
Source: VSS
Date: 4/13/2013 3:23:59 PM
Event ID: 12348
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: User-VAIO
Description:
Volume Shadow Copy Service warning: VSS was denied access to the root of volume \\?\Volume{03acf86c-5be9-11e1-99d1-78843cfd6539}\. Denying administrators from accessing volume roots can cause many unexpected failures, and will prevent VSS from functioning properly. Check security on the volume, and try the operation again.
Operation:
Removing auto-release shadow copies
Loading provider
Context:
Execution Context: System Provider
Event Xml:
<Event xmlns="
http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="VSS" />
<EventID Qualifiers="0">12348</EventID>
<Level>3</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2013-04-13T19:23:59.000000000Z" />
<EventRecordID>15199</EventRecordID>
<Channel>Application</Channel>
<Computer>User-VAIO</Computer>
<Security />
</System>
<EventData>
<Data>\\?\Volume{03acf86c-5be9-11e1-99d1-78843cfd6539}\</Data>
<Data>
Operation:
Removing auto-release shadow copies
Loading provider
Context:
Execution Context: System Provider</Data>
<Binary>2D20436F64653A2053505250524F564330303030323333312D2043616C6C3A2053505250524F564330303030323237332D205049443A202030303030303432382D205449443A202030303030363632382D20434D443A2020433A5C57696E646F77735C53797374656D33325C737663686F73742E657865202D6B2073777072762D20557365723A204E616D653A204E5420415554484F524954595C53595354454D2C205349443A532D312D352D313820</Binary>
</EventData>
</Event>
Log Name: Application
Source: Microsoft-Windows-User Profiles Service
Date: 4/13/2013 3:26:06 PM
Event ID: 1530
Task Category: None
Level: Warning
Keywords:
User: SYSTEM
Computer: User-VAIO
Description:
Windows detected your registry file is still in use by other applications or services. The file will be unloaded now. The applications or services that hold your registry file may not function properly afterwards.
DETAIL -
5 user registry handles leaked from \Registry\User\S-1-5-21-3130692141-3789891193-1470044760-1005:
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005\Software\Microsoft\SystemCertificates\Disallowed
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005\Software\Microsoft\SystemCertificates\My
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005\Software\Microsoft\SystemCertificates\CA
Event Xml:
<Event xmlns="
http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-User Profiles Service" Guid="{89B1E9F0-5AFF-44A6-9B44-0A07A7CE5845}" />
<EventID>1530</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2013-04-13T19:26:06.855316400Z" />
<EventRecordID>15205</EventRecordID>
<Correlation ActivityID="{02EFFC50-F800-0002-C395-0A813B36CE01}" />
<Execution ProcessID="348" ThreadID="9928" />
<Channel>Application</Channel>
<Computer>User-VAIO</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData Name="EVENT_HIVE_LEAK">
<Data Name="Detail">5 user registry handles leaked from \Registry\User\S-1-5-21-3130692141-3789891193-1470044760-1005:
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005\Software\Microsoft\SystemCertificates\Disallowed
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005\Software\Microsoft\SystemCertificates\My
Process 640 (\Device\HarddiskVolume3\Windows\System32\lsass.exe) has opened key \REGISTRY\USER\S-1-5-21-3130692141-3789891193-1470044760-1005\Software\Microsoft\SystemCertificates\CA
</Data>
</EventData>
</Event>
Event Xml:
<Event xmlns="
http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Virtualization Client" />
<EventID Qualifiers="16384">3057</EventID>
<Level>3</Level>
<Task>6</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2013-04-13T20:00:36.000000000Z" />
<EventRecordID>15230</EventRecordID>
<Channel>Application</Channel>
<Computer>User-VAIO</Computer>
<Security />
</System>
<EventData>
<Data>{tid=A08}
</Data>
<Data>
</Data>
<Data>4.6.1.10263</Data>
<Data>C:\Program Files (x86)\Microsoft Application Virtualization Client</Data>
<Data>C:\ProgramData\Microsoft\Application Virtualization Client\</Data>
<Data>USER-VAIO</Data>
<Data>Windows 7 64-bit Service Pack 1.0 Build 7601</Data>
<Data>
</Data>
</EventData>
</Event>
