WinXP Home SP3 CD burning error

Hi:

I'm running WinXP Home Ed, SP3. My pc has its own CD Burning software

(Roxio) and works fine. But for simple tasks, like storing a file in a

CD/CDRW I like using windows built in burning capabilities (Send to->CD). It

also works fine, but I have noted that when I add files to a CD that already

has some files, the newly added files are stored but burning wizard ends with

an error: An error occurred when burning CD, delete files, store for later,

or expulse CD?. However files are correctly stored... I can add more files

to the cd and again the same error, but files are OK. So what's happening?