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If these issues are related it's a power issue. Make sure you're not running on battery only. If not check security settings for browser and laptop. Update your DVD driver and DVD software. Or if the problem started after an update then roll back.
Both Dell Part numbers 18THT and 5W299 are 8X DVD-ROM Drive Modules. DPN 18THT is compatible with Latitude C series and DPN 5W299 is compatible with Latitude D series. The two drives have different and incompatible connectors.
Your Latitude C640 is a C Series Latitude. You can therefore not use DPN 5W299.
If you need a DVD drive module, get DPN 18THT or an alternative Latitude C series drive.
You probably need to clean out the pc. Get rid of programs that are not needed or used. Do a "Disk Cleanup", Defrag until it takes only about 1-2 min to complete. Get an Anti-spyware/malware as well as an Anti-spyware program and run it once a week.
You might want to also invest in more RAM. 512mb these days isnt much.
Sounds like either there is not enough memory in the laptop to handle what you want it to do, or the operating system needs to be restored. I would try the latter of the two, because that is cheaper, and then if that does not work, then upgrade the RAM
I'm assuming you have tried a different dvd also and no joy, but it may need a lens clean or it is unable to read dvd anymore as the tracks are closer together than a cd and the alignment of the laser is faulty.
Notebook roms are replaceable but only mainly from your notebook manufacturer.
You could also use an external dvd writer via usb, although this then doesn't make your notebook as portable, if you need to read a dvd disc.