No two situations are the same. Please raise a new post of your own to get focussed help.
That's odd. I have sometime found drives to be a bit fussy so there's no harm cleaning the CD in soapy water, use your thumb inside to outside (rather than in circular motion). Dry with kitchen towel afterwards.
You could burn an ISO of Puppy Linux (Live CD) on another machine. Then if it boots the other machine to Linux you could try it on this one. They are useful to have because you can always recover your files onto a USB stick if Windows is screwed. It also verifies your hardware apart from the HD, which is doesn't use.
If you go this way you could try renaming klbg.sys to klbg.old (you can access the HD). This is a Kapersky AV file so the machine might boot normally if it is disabled.
We all live on a ball.