I am doing other research for you, (into my sleeping time here) however in the meantime your problem maybe dust.
Clean out your dust bunnies could be a start to make sure it is not an over heating problem.
Alternatively your machine may have a hardware problem. Software troubleshooting is unfortunately pointless until the underlying hardware-level defect is resolved. It may be an outright broken bit of componentry, or
it could be insufficient cooling due to dust build up or the fan being blocked by placement.
After you see to the above suggestion, please post back with the results.
Glad the system restore worked for now, but we need to investigate further to find the first cause of your issue. A little research shows me that error 11 is as follows:
Quote:
ERROR_BAD_FORMAT
11 (0xB)
An attempt was made to load a program with an incorrect format.
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Does Event Viewer show an error immediately after boot would be good to know.
kind regards,