If you are experiencing issues with your Dell Streak, then a hard reset back to factory original may be the way to go to fix common or uncommon problems.
To perform a hard reset
Make sure device is off
Hold the Home Button + Power Button and Volume Up Button at same time.
Now select Factory reset option.
Now your device will automatically reset itself and restore to factory version.
To do a soft reset
Open the settings icon.
Press the privacy button.
Select the factory restore option.
Press the restore button.
At last press the done option.