I have a Dell Dimension E-520 running MS 10 that a friend gave me. He had had some problem booting and tried to get to a recovery point but there were none. The next thing he said he did was a system reset. Here is where the problem is. When I try to boot I get a blue screen with RECOVERY at the top, below that a message stating "The operating system cannot be loaded because the kernel is missing or contains errors." There is an error code 0xc0000221 which I went online and found a repair kit for that error, downloaded, burnt it to a disc but the PC will not read the CD-ROM drive. I have an MS 7 installation disc but when I try to boot from the ROM drive I get the error "Selected boot device not available-" can anyone give me an idea as to what I can do (if anything) to get this PC up and running?