I HAVE A DELL 1545 AND I HAVE WIN 8 X64 ENTERPRISE AND I INSTALLED BLUETOOTH DRIVER MANUALLY
I'LL SHOW U HOW :
1- DOWNLOAD THE BTW DRIVER OF WIN 7 X64 FROM THIS SITE :
http://ftp.us.dell.com/network/R228749.exe
2- OPEN IT AND CLICK ON CONTINUE THEN OK AND OK
3- THEN A MESSAGE OF USER ACCOUNT CONTROL APPEAR CLICK ON NO
4- GO TO C:\dell\drivers\83V6K\Win64 AND OPEN INST.EXE AND INSTALL IT IT TAKES ONLY FEW MINUTES
5- AND HERE U R BLUETOOTH DRIVER INSTALLED AND WORKING 100%
IF U HAVE ANY QUESTION PLEASE EMAIL ME AT :
HOPE IT WAS USEFUL FOR U SEE YA AND PLEASE SHARE IT