There can be several possible reasons for this rebooting loop you are experiencing. It depends upon exactly when in the booting process this happens, and what, if any, error messages you see.
I would like to know if you are able to boot into safe mode ok. Press the F8 key repeatedly at bootup, and choose Safe Mode when prompted. Also please test Safe Mode with a Command Prompt.
One more option to try is Last Known Good Configuration. This option is found the same way.
The fix will depend upon the results.
I would like to know if you are able to boot into safe mode ok. Press the F8 key repeatedly at bootup, and choose Safe Mode when prompted. Also please test Safe Mode with a Command Prompt.
One more option to try is Last Known Good Configuration. This option is found the same way.
The fix will depend upon the results.