DVD burn error 'there was a problem'

I have burned CD's and DVDs before no problem. Now I get a window 'Error - there was a problem burning this disc' after maybe 2 minutes of building the image file. Using the built in burn appl in 7 Pro. (I'll try another appl if I can't solve this.)

DVD +R disc is fine, doesn't begin to even burn. Can't be hardware because it's worked fine before. Can't be intermittent as I haven't removed/touched any internals.

Tried making the pagefile larger, to match ram of 2GB ( min 2048, max 4000). Same. Lots of room on the hard drive. Can't believe it would be because data is 3.64 GB because 7 should just use the hard drive if it runs out of ram.

Thank you in advance.

Basically there are four reasons for a burn error.

1. sub-standard media - Always use a known-to-be good branded media

2. debry-laden optical drive - periodically clean the lense with a lense-cleaner CD.

3. speed burning - do not burn at the maximum speed. Always lower the burn speed, the lower the better.

4. Multitasking - Although theoretcally with power-horses on your hand multitasking is less troublesome, when it comes to burning prefer to do a single job that is burning and leave it alone doing that one task.

:)