It could happen that clicking on Devices and Printers the windows hangs up and doesn't show any print.
To solve take a look to the following article:
Windows 7 devices and printers hangs hotfix
Original Article
http://support.microsoft.com/kb/2486635/
After disabling bluetooth it happen the above problem.
You need to download the following Hotfix:
32 bit patch
http://hotfixv4.microsoft.com/Windows%207/Windows%20Server2008%20R2%20SP1/sp2/Fix391995/7600/free/441767_intl_i386_zip.exe
64 bit patch
http://hotfixv4.microsoft.com/Windows%207/Windows%20Server2008%20R2%20SP1/sp2/Fix391995/7600/free/441768_intl_x64_zip.exe)