I am using Windows xp.
adb devices command doesn't show my xperia x10 and eclipse doesn't recognize my xperia x10 I have htc magic and it works fine.
I downloaded driver from: http://developer.sonyericsson.com/community/docs/DOC-3328#cf
and I installed driver without problems and I don't have for example yellow question mark on driver in device manager.and it is very recent ()
I downloaded sony ericsson applications like Sony_Ericsson_PC_Companion_2.00.134.exe and Update_Service_Setup-2.10.5.11.exe and they can detect my phone
but other apps can't detect my phone for example: adb devices command cant detect my phone eclipse and android plug in cant detect my phone apk installer app cant detect my phone
note: I followed this documentation from Sony ericsson in driver installation: http://developer.sonyericsson.com/community/docs/DOC-3496#cf
and I think that I noticed some thing mah help in solving this problem
in this documentation, they say that I should replace default adb.exe with another one that sony ericsson developed and this file is included in driver zip file.
but I didn't find this file in driver zip file that I downloaded from sony ericsson
if it is true then if someone gave this missing file, may be my problem will be solved.
I had the same problem, although I installed every driver required and the PC Companion application adb couldn't detect my Xperia Ray so after hours of unsuccessful attempts I installed an application named EasyTether from here: http://easytether.blogspot.com/2010/10/easytether-drivers.html I followed all the instructions and finally I could install my first android application to my phone.