I have a 3 year old Dell Inspiron 15 5000 running Windows 7 Pro.
There is no CD/DVD drive in the laptop.
It has TrendMicro AV and is up to date with windows update.
Until yesterday it was fine.
I recently plugged my Samsung S5 phone into it to download pictures from the phone to the laptop.
I don't remember if it was rebooted after the phone was connected.

Yesterday when I turned the laptop on it went into repair mode but could not repair,
it gave me "unspecified changes to system config might have cause the problem OS loader generic failure 0xc0000225

repair action: system files integrity check and repair result: failed error code=0x57

I tried going back to the last saved check point and it did not fix it.

Any help would be greatly appreciated.