NERO Burning and Roxio Easy CD creator not responding to burn Files on CD and DVD

I have External Sony DVD writer.
i have so much files to be copied into CD’s and DVD’s.
Just two days before i don’t know what the problem is…
I always burn in Nero Burning ROM 6 SE, when i added those files to burn, and finally clicked the burn button , the next screen status shows the burning[copying] staus, in the first shows Power burn activated, and the second step says it started Caching files…
then, it stays for long time for about minimum 10 minutes to burn 650 MB in CD-R without any further action status.
So i decided to cancel the copying process, it doesn’t responding, not closing the whole software by clicking alt+ctrl+del to close Nero burning software for ‘not responding’.
I reinstalled and also done uninstall and installed freshly, nothing happens, the same problem occurs in other category of copying files by adding data files.
Please tell me what the problem is and how to resolve it.
I am using Winows XP professional with sp2.

I had also installed another burning software Roxio Easy CD creator, nothing happens, just hangs the software,the same problem like occurs in Nero.