overall, it sounds like you have a failing hard drive.
-ok, kernel inpage error indicates that a driver can not be loaded into memory because of a storage error
the other bugcheck is caused because a critical process exited most likely csrss.exe got a error when it needed storage (IO error) and had to exit, it is a required process so windows bugchecked.
your system 5 min lag on boot could also be a hard drive failing to seek and getting errors and lots of retries. (or a disk error accessing your pagefile.sys)
now if this is a desktop system, I would guess that your hard drive is failing.
if this is a laptop system, you have to check one other thing first and that is are you starting your system from sleep? or from a hibernation mode?
so, I would check the drive data cables and power cables. do a chksdk /r /f on the drive to repair any filesystem corruption. then run a cmd.exe as a admin and start the system file checker utility
sfc.exe /scannow to check for corrupted core system files.
(let me know if the command fails to fix a problem)
if these don't find a problem, you want to go to you control panel virtual memory settings, turn off the virtual memory, reboot. rename the pagefile.sys to pagefile.old, go back and turn on the virtual memory and reboot.
also, make sure there is plenty of space on you disk drive if you have certain types of driver bugs the pagefile.sys will grow in size until it gets to its max size and returns a error.
any chance your drive is a solid state drive?