Okay let me explain my problem.
1.started with i turn off pc morning turn on blue screen no any writting with mouse cursor.
2.went to google for assistance=system restore.
3.never worked turn on with a black screen with cursor after restore.
4.tried to reinstall os without losing data problem 500 gb disk full no space for install!c drive 7 gb d was 1 gb free space.
5.next restart instert a bootable media press any key{corrupt hard disk}.
6.ubuntu live cd to salvage data to an external harddisk, disk showing unallocated with a red question mark.
7.also said lacked partition table,tried to create one but in the process i realised all data will be erased.am still trying with testdisk since not familiar with the commands.i think my os is corrupt too last i cud see in boot with installation disk, i cud see files and folders intact but there was a new drive wich wasnt there named boot something dont rem well and installation disk freezes now.also was unable to install testdisk manually no configure for ./configure and still downloading knopix which has testdisk pre intsalled.slow connection.haha
thank you all for suggestions and comments.