pablonava

Please, a need Help. My PC is using Windows XP, when i turn on the PC, there is a message "Press F1 for boot or F2 for setup" more less. I run Windows Recovery Console and type "chkdsk c:" and i got an error "the specified drive is not valid, or there is no disk in drive", i try with /p and /r parameters and is the same response. also i run "MAP" and only display Drive a: and d: what can i do Now. i don´t want losse my data.