Hi,
Fatal Exception errors can be caused by numerous things. Hardware, drivers, corrupt files , resource conflicts and so on.
Since you recently installed a CDROM open the box and check for anything that may of came loose etc. Especially the CPU fan.
Please include the entire message. There is usually another code that goes with fatal exception errors. It will be something like,
"Fatal Exception OD or OE etc." at the address you've included.
Protecting your PC from viruses should be a priority. Most of the time it's too late before people realize how important this is. You can create a bootable virus scan disk on another PC if abvailable. Write protect the disk and run the scan on your system.
For step by step instructionson troubleshooting Fatal Exception Errors go to the link below.
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q150314