Kernel_Stack_Inpage_Error is a page of kernal data requested from the pagefile could not be found or read into memory.
This message can indicate a disk hardware failure, data corruption, master boot file corruption or possible virus infection.
Kernel_data_inpage_error is a page of kernel data was not found in the pagefile and could not be read into memory.
This might be due to incompatible hardware or drivers.
Run a disk scan and virus scan.
See here for more help.
http://support.microsoft.com/kb/315266