On our Support page I have found this driver and this software for the Dell Wireless 380 for Windows 7.
Please remove all prior installed Bluetooth drivers and software.
Is the Bluetooth device detected by BIOS and Windows device manager?
Please note that this is a German community forum, which is moderated by German speaking tech support. If you are located outside of Germany, Austria and Switzerland, I recommend you to use the English community forum instead.
Florian Steinau Community Technologist - Business Client Social Media and Communities Professional Twitter | LinkedIn | XING