It could be some hardware/driver issue; considering your discriptions.. You get a black screen after installation.. No desktop; start with the IDE/SATA drivers for your motherboard. Get a flash drive/usb thumbdrive, then extract new/known good versions of all your hardware's drivers, onto the thumbdrive..

Make sure you have the drivers and bios versions suitable for seven, and know where to find them.. When you run the seven installation, when it gives you the prompt to "load drivers" point to your motherboard IDE or SATA driver.. If you want to take that a step further, load a known to work with seven/ good version of forceware for your 8800GT

Another thing is to make sure that you are not overclocking while attempting to install windows/ ensure that your memory timings and voltage are "factory" even if you have to enter them manually.. If you want to get further into this regarding bios/memory settings; please post the exact motherboard make/model:revesion, motherboard bios version, memory module actual part number/s and approximate date of mfg or about what year/month they were purchased "they sometimes change the actual memory chips used on the stick's "of same model/part number" and the voltage/timings may vary on same part number memory sticks, depending on the date of mfg...

If you have not done so, clear the DMI pool data of your motherboard and completely reset the bios.. Unplug the power supply, the monitor display cable, any device that might be plugged into anything that has a common ground.. Then take the Cmos battery back/clock battery out, hold a coin between the + and - of the battery terminal, then press and hold the power and reset buttons on your computer for 30 seconds to a minute.. re-install the battery, cords/rebot then load the seven installation disc, then when it prompts load the IDE/SATA driver, then completely reformat the hard drive, then re partition, reboot and reload the IDE/SATA drivers, ensure that the drive shows up, that it has a drive letter "hopefully C:" then try re-installing seven.


I think the seven trial has ended, so I'm not sure how legal it is to try and load the OS, even if you got it from MS, let alone some p2p source... I couldn't find a copy of sevens EULA.. So I'm not apposed to this help thread, but if someone points out and can prove there's something illegal here, we will have to close/delete your thread.