I have a single 160GB hard drive, but it is partitioned this way C: 14gb and D: 129gb. The C: drive was getting full and I was trying to change the partition percentages, so I went to disk manager and I formatted the D: drive (which had nothing on it). I couldnt figure out how to change it so I left it alone. The computer was working fine later that day and then I lost power to my house. Upon rebooting I recieved a Missing Operating System error and after several reboots, It changed to Invalid partition table. I need my pc to do my online college and now I am screwed can you help?