i turned my pc on ( hp pavilion 751n) one day and it said "no operating system", how did i lose XP. I don't have a boot disk. And I can't get it to go in safe mode like i use to do for windows 98. all i have are recovery disks that will erase everything and restore it to original settings. so i buy a new pc thinking i can slave out the old HDD like i've done before but NO! new pc's are SATA old pc was IDE. so i buy an adapter and connect it via USB. The new pc recognizes the drive but wants me to format it to be abled to use it.so how do i retrieve my old data ?