PC doesn't boot, stuck in restart loop

Hi,
I turned pc off as normal yesterday with no problems, switched back on today and all hell broke loose. When I boot up in normal mode, pc hangs and then reboots with the option to start normally or in recovery mode. Selecting either mode results in same thing. Tried safe mode and same again but in safe mode, I get to a screen that offers recovery option to repair o/s but there's no o/s in the diaplay options. Sometimes I will get a memory error and sometimes other errors such as wsdcore.dll is is not designed to run with windows etc. anyone have any ideas please.

System is acer aspire x3200
Amd phenom x3 8550
1tb hdd
4gb DDR 2 memory
Nvidia 250 sparkle graphics card
 
The hard drive has probably failed... Try to re-install Windows fresh. If this fails, replace the hard drive
 
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