on the laptop would lead you right to support issues for that laptop.
It would have got you to various options for restoring the computer to factory condition. Since You already tried an upgrade I'll just link you to the page for making use of the Restore partition and the F8 key to get there:
Since backing up data files isn't an issue as they have already been overwritten you need to scroll down the page and start with Step 2.
DO NOT skip steps within the instructions.
Hey! My brother brought his laptop to me to install Windows 7. The computer was running Vista Home Premium. It installed perfectly and then crashed leaving me with no operating system. Now when I try to reinstall the original OS, I get a message saying that Windows cannot find a suitable drive for installation? When I try to reinstall Windows 7 a second time, it does not even detect the 220gb partition, only the smaller recovery partitions. How do I restore to factory settings without a recovery CD? Is there something else I can do to allow Vista or Windows 7 to install? So far all I can do is put XP professional SP 3 on. Can I access the recovery partition without a recovery CD? Specs are P4 Core 2 Duo, 2 GB ram, 250gb HDD. Thanks in advance........