Speedstep its a Dell 1520, windows vista, tsstcorp ts-l632h drive , have tried sony media and verbatim

have tried your suggestions already, Is there a dell recommend burn test?

Which Laptop?  Which OS? Which Model DVD Drive? Which Brand of DVD?

Is this DVD -R media is this DVD +R Media is this DVD +RW media? is this Double Layer Media?

Method 1.
These steps are for Vista, but still you can use it for windows 7.
“The only change is Upper Filters and Lower Filters listed below are invalid registry entries, please remove them after completion of this process.”
   
   1. Click Start and then click Run or .
   2. Click All Programs click Accessories, and then click Run.
   3. Type regedit, and then click OK. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
   4.  In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
   5. In the right pane, click UpperFilters.
      Note You may also see an UpperFilters.bak registry entry. You do not have to remove that entry. Click UpperFilters only. If you do not see the UpperFilters registry entry, you still might have to remove the LowerFilters registry entry. To do this, go to step 8.
   6. On the Edit menu, click Delete.
   7. When you are prompted to confirm the deletion, click Yes.
   8. In the right pane, click LowerFilters.
      Note If you do not see the LowerFilters registry entry, unfortunately this content cannot help you any further. Go to the section for information about how you can find more solutions or more help on the Microsoft Web site.
   9. On the Edit menu, click Delete.
  10. When you are prompted to confirm the deletion, click Yes.
  11. Exit Registry Editor.
  12. Restart the computer.
Here is the link for more information:
Your CD drive or DVD drive is missing or is not recognized by Windows or other programs
http://support.microsoft.com/kb/314060
Please perform these steps and let us know if it helps.
Please check this link for more information:
http://windows.microsoft.com/en-SG/windows-vista/Troubleshoot-problems-with-CDs-or-DVDs

Method 2. Uninstall and re-install the cd-dvd drive:
If the drive is not listed, remove and reinstall the existing drivers.
To do this, follow these steps:
1. Click Start and then click Control Panel.
2. Click System and Maintenance, click System, and then click Device Manager.
Note If Control Panel is in Classic View, double-click System, and then click Device Manager.
3. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
4. In Device Manager, expland DVD/CD-ROM drives, right-click the CD and DVD devices, and then click Uninstall.
5. When you are prompted to confirm that you want to remove the device, click OK and Restart the computer.
    After the computer restarts, the drivers will be automatically installed.
 

Which program are you using to try to burn your DVD?

same way as always ,windows.,also tried dvd videosoft

I would suggest DVD -R media.  If the drive is not Bad you may need to reinstall windows as there is an upper and lower filters problem. 

 I consider DVDVIDEOSOFT to be malware.  Their FreeStudio software breaks things imho.

This is not a Dell Hardware issue.

I know Hardware  Service contractors that have  Clients who swear there is no problem with .....

And Yet when a new drive is installed , Clean Windows installed (without DVDVIDEOSOFT or other Malware),  IMicrosoft Security Essentials is installed, Microsoft Windows Updates are Done with  all updates including "Optional" updates and then They

Run CCleaner and Defraggler and then Show the End User that EVERYTHING On their system works with clean windows.

They also sometimes boot a Live Knoppix DVD and show them that the system works fine with another operating system.

The End Users say that they refuse to pay for reinstall of windows because "they could have done this".

So the Contractor puts their Old Malware/Spyware infected hard disk back in and let them know that if they do not pay for the service call they will be removed from the serviced client list.   These End user clients are not Dell Support Customers but they do have Dell and other vendor's hardware.

Can dvdvideosoft.com give you viruses? - Yahoo! Answers

User Review Summary for dvdvideosoft.com 

Your CD or DVD drive can't read or write media - Microsoft Support

Run now

Overview - Online stores

Memorex Storage media - DVD-R - 16x 4.7 GB      Spindle, qty: 50, PC The DVD-R 4.7GB 50 pack is used with DVD recordable drives that support DVD-R/RW blank media and certain DVD-RAM recordable drives that incorporate DVD-R as a write once solution. Add to Shopping

TSST TS-L632H DVD+ - Documentation

Extended Specifications

The media is the same as Ive always used ,DVD+R , I freed up some hard drive space and cleared the temp burn files and it appears to be ok now, i did run a speed test and the drive appears to be a little slow.