Despues de un tiempo (y sin antivirus instalado) me ha vuelto a salir pantallazos azules, uno ayer y otro hoy

Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.

On Tue 19/08/2014 8:47:33 GMT your computer crashed
crash dump file: C:\Windows\Minidump\081914-59810-01.dmp
This was probably caused by the following module: Unknown (0x00000001)
Bugcheck code: 0x1000007E (0xFFFFFFFFC0000005, 0x1, 0xFFFFF880031C5818, 0xFFFFF880031C5070)
Error: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M
Bug check description: This indicates that a system thread generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
A third party driver was identified as the probable root cause of this system error.
Google query: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M



On Tue 19/08/2014 8:47:33 GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: ntkrnlmp.exe (nt!KeBugCheckEx+0x0)
Bugcheck code: 0x7E (0xFFFFFFFFC0000005, 0x1, 0xFFFFF880031C5818, 0xFFFFF880031C5070)
Error: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
Bug check description: This bug check indicates that a system thread generated an exception that the error handler did not catch.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.




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Conclusion
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2 crash dumps have been found and analyzed.
Read the topic general suggestions for troubleshooting system crashes for more information.

Note that it's not always possible to state with certainty whether a reported driver is actually responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.