Windows could not startmissing or corrupt windows xp system32 config system

Hello TR!

I have a serious problem and here it is. When I turn-on my PC. this message appears, “Windows could not start missing or corrupt windows xp system32 config system” and the problem is I don’t have a CD ROM (external CD Drive only).. I have a very important file on my PC that I want to have a copy of it before fixing my computer.

I would really appreciate the help.

Thanks in advance..