crysis, cd/dvd-rom problem??

I uninstalled crysis cuz it didnt work, because of my new RAM i had just installed so i took it out again I realised that it was the RAM that f*cked up the game after I uninstalled it. Started my comp and and oped the dvd-rom and inserted crysis to install it again. The dvd-rom started making strange noices and when 10 % of crysis had been loaded a messege comes up: Erros 1305. Error reading from file C;\Program Files\electronicarts\Crytek\crysis\game\Sounds.pak Verify that the file exists and that you can access it.

Is it my dvd-rom or is it crysisthat is the problem.

My specs are:nvidia 8600gt, Amd 3500+ , 2bg RAM

This may help: http://support.microsoft.com/kb/873281

It did not:'('''

Thanks anyway