Have been doing battle with my puter unendingly. After Zoek 3 & 4, puter felt very light and appeared as tho all was well. When I rebooted my heart sank when I saw pop up on my screen, "Operating system not present". I thot "Oh, #####, the text or something I did wiped out my Operating System." I tried another time and got the same response. Then, I tried to get newbie smart and clicked F8 on start-up and selected "last good configuration." That worked and allowed me to get into my puter and get some things done and communicate with someone about what was happening with my puter. This morning I tried a normal start and got the same "Operating system not present" and so I used the F8 last good config and it didn't work. I tried again and it worked but the computer went back to freezing. (Forgot to mention above that the good sessions ended with the puter again freezing). My guess is that something is wrong in the registry. I have a Windows 7 Reinstallation DVD, but when I put it in, I find the directions on it r different than those I find on the web. Someone advised me to try to do the “Start Up Repair”, but on my disc the instructions look like it wants to do a full reinstallation. Do you think a Start Up Repair” might solve my problem and should I be able to do this from the Windows 7 Reinstallation DVD? If u think it might solve my problem and if it can be done from the disc, should I just continue to follow the prompts altho they appear to be heading for a complete reinstallation but at some point I’ll see instead a prompt for “Repair Your Computer” which will eventually allow me to select “Start Up Repair”? The info on the net indicates this is what I’ll find if I just continue to proceed. If I install over what I already have, will I screw up my puter? Can I make any mistakes? To repeat. There r 2 problems: 1) Freezing and then I have to hard stop and reboot 2) Inability for the puter to boot up normally (often flashing “Operating System not Present”). I await your reply eagerly.