Hi Geoffrey
The ERROR--0xc0000006 error code is one of those warning which unfortunately can be caused by a number of things.
Always try the least destructive option first, switch the machine completely off, and then reboot.
Remove one of the antivirus programme if you have two installed as instructed above.
Quite often this error point to either;
RAM (memory) failure
Hard Drive failure
Corrupted system files
RAM (memory) failure - If your computer has more than onememory module fitted remove one, and try again, then replace and remove theother one.
Hard Drive failure - When you look inside the case, take anote of the make and model of the hard drives, then go to the manufactureswebsite; most of them have a disk tool you can test the disk with.
Corrupted system files - you can do a Windows repair by inserting the Windows disk in the CD player. You will of course lose your data if you have not stored it on another hard drive or partition, so take care with this option.
Let us know how you get on.