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User asked for software and where to check. &nbsp;The following are all suggestions that could follow on from the akser's testing. &nbsp;These do NOT necessarily lead to a solution but are all possibles that the asker could follow which he asked for.<br />
<br />
dbrunton for suggesting checking Events, new Profile, and virus scan<br />
<br />
John Hurst for suggesting Action Centre and Reliability History<br />
<br />
nobus for suggesting temperature check<br />
<br />
Gerald Connolly for suggesting Task Manager and Resource Monitor
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User says this but no error messages <br />
<br />
I've ran HW diags on memory and HDD etc and all ok <br />
<br />
Software - what to check / where ?
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User says this but no error messages 

I've ran HW diags on memory and HDD etc and all ok 

Software - what to check / where ?

PC hangs and crashes in win 7

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.