Un-readable DVD-R in PC

[petrolhead]

have a problem with trying to read a DVD-R on my PC using Sony DRU500A.

Explorer, Power DVD or DVD Decrypter shows no files found on the disk.
Although this DVD-R plays on my set top player the PC displays the disk as blank.

I wonder if it is a media problem.

I bought a fresh batch of EMTEC DVD-R from staples (UK) yesterday, I've used these reliably for sometime.

I burnt a home movie using Ulead DVD Workshop (as usual).
I want to delete all my supporting avi files and use Decryter for making copies for family members.

I have tried other dvd-r disks and burnt in the same way and decryter recognises them.

My question - Why would decryter not be able to read a DVD-R when my Dansai player does?

Thanks in advance.

[txpharoah]

The disc is UDF-only format.
It has no ISO table, which is what a PC reads.

DVDs readable in PC have UDF/ISO Bridge formatting.

To play disc in PC, start PowerDVD BEFORE inserting the disc. The just hit PLAY in PowerDVD.

[petrolhead]

Thanks for the reply.
Still no luck.
Start PowerDVD, insert disk, error reported " no disk in drive K"