A few days ago I encountered a strange bluetooth problem on my Windows 7 (64bit business, Dell E6520). While I was working suddenly my Dell bt travel mouse disconnected. Tried to reconnect a few times, but couldn’t get it working.
Swapped batteries, and tried another computer: no problem whatsoever. Began to think that I was facing a hardware problem (again!), but then I realized that the device might have been blocked somehow. And guess what… I went looking for “devices and printers” and the Dell bluetooth mouse was still listed, however not connected. The problem was easily solved by removing the device (right click, remove device) and then establishing a new connection.
Not sure what software you’re using for antivirus, but I just tried allowing my Norton 360 firewall to allow an exception (add) for the Set Point program. I have same computer with a Dell travel mouse, and yes, it has been a recurring issue; albeit, infrequent.