Hi thanks for all he help.
Last night I completly erased the disk, and reburnt it.
The same thing happened, it was invisible to explorer. I ejected the disk,
put it back in, and it then could be read by explorer.
I burnt some other things on other disks and they all reacted the same!
So it looks like I'm sorted
I told you I was a newbie...... I think I will :
1. Steer clear of Direct CD.
2. Buy GOOD quality CD-Rs in future.
3. Come back here when those CD-Rs turn into coasters
Thanks again everyone.