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my xperia p which runs on ics is not detected by my pc which runs windows xp i also installed sony pc companion but its of no use.
disable your firewall and antivirus and try again, it will be wise to install JAVA (google JAVA download)
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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