for the INACCESSIBLE_BOOT_DEVICE error and it is usually either a driver or the HAL (or other file corruption).
First things to try are:
# Startup with Last Known Good Configuration to undo related registry and driver changes.
# Use System Restore to undo recent changes.
If unable to boot to any of the boot options you can still perform system restore from the recovery console by following the instructions at this link -
While in the Recovery Console you can also run the command CHKDSK /R as corruption of the boot volume is one of the causes of the stop error.
Here is a handy link with several other steps you might take to cure your problem --
Soooo, i was trying to stream some always sunny in philly when my avg alarms start sounding "VIRUS ALERT!!! ABORT CONNECTION!" I clicked abort connection, everything seemed good, i kept watching my show. When the show ended the screen started getting whacked out, ie windows ghosting n stuff. so i rebooted. When windows began to load however, i was greeted with a blue screen of death with the message of STOP: 0x0000007B .... well, im 100% its a virus but i cant get into windows xp normally, in safe mode, nor just plain old command prompt. I keep getting the BSOD with every option!HOWEVER, i do have win 7 installed on a partion on the same drive, and it still works (i was using XP while watching the show). The problem is i cant see my win xp c drive when i start the win 7 partition, soooo i cant figure out any way to scan that section of the drive. I know this problem can be solved wihout repartioning, some1 please tell me how i can scan my drive for this damn virus! Thanks