Memorex DVD burner not burning at correct speed & no

[Tasty Cat]

Memorex DVD16+/-DL4RWD2 is what's listed in my device manager.

I've had this Double layer Memorex DVD burner for less then a year. Not long after it was installed, I noticed that while it was saying that it would take 15 mins to burn my 4x dvd, it was actually taking an hour.
I used system restore on my WinXP & it worked fine.
I've done this twice before & each time it's gone back to burning like it should.
Well, it's doing it again & when I went to run a restore again, it shows there are no restore points available. I have never had it show no restore points available before & I don't know what to do about it.
It is set to have the system restore activated & I while I realize that whatever the problem is, I've probably just been masking it, but at least it was working & now I'm at a loss as to what to do.
So, I've actually got 2 problems I guess.
The 16x burner is taking about 45 mins to burn a 4x dvd when it shows it will only be 15 & my system restore is not making restore points like it should. Help guys!!!!
TC

[skeg64]

it is probably reset to PIO mode, and using system restore is setting it back to Ultra DMA mode (as it should be).

Check this thread:
https://www.videohelp.com/forum/archive/t275007.html

or try some searches for "Ultra DMA".

[Tasty Cat]

Just did it & it worked, thanks!! TC

[Tasty Cat]

Well, now, after I deleted the secondary one & rebooted & it added it again & it's set to the right settings, now my drive won't play movies, either commercial ones or mine. It won't recognize a dvd with an mpg on it either.
It just spins for awhile & then stops.
If I bring up the drive on the explorer, it shows empty, but all dvd's, mine & commercial, will play on the dvd player.
Now what did I do?
Help!!!!!!!!!!!

When I bring up dvd decripter, it says the device is not ready
When I bring up dvd shrink & I go to open the drive, it says it's empty & if I still click on it, it brings up a box that says there's no disk in the drive & the parameter is incorrect.

I tried a restore back yesterday & the day before & nothing.

The last 2 dvds I've tried to burn have failed.