oh boy! ok, let's see....
consider safe mode as normal windows with minimum things (drivers, services) loaded.
The same way U got to "Last good known config" you go into safe mode.
So, at startup press again F8 and with the arrow keys, select Safe mode, and press Enter.
You will see a lot of files loading on your screen (don't panic, it's normal)
Depending on your computer, the time is usually from a few seconds, to a few minutes (on old pc's)
Just let it load. Once it's done U should be able to enter your user , and you'll see a black screen (no wallpaper) with the word Safe mode in the four corners of the screen.
Now, once in Safe mode, you can sort of restore your PC's previous system settings, by using a little program called
System restore.
To open it go to Start menu>Run and type
msconfig
and press enter.
Now click the Launch System restore button
You'll see a calendar and you can choose a previous date to restore to and click next.
then it will restart.
Can U go to normal Windows.
We'll talk about the cd only if this doesn't work.