blank screen on safe boot and normall boot

i recently had many viruses dealing with my explorer so i ran adware remover after deleting as indicated i restarted my computer and found out that the ntldr file was missing and i had to restart. since then ive put that file to a disk and loaded computer. its goes to the screen when you hit F8. tried booting windows normally after selecting, the load bar at bottom of screen loads then goes to a blank black screen. go try safe mode boot. the screen stops after loading a couple dozen system files and freezes. again i try to boot with any other safe modes, command or networking same blank black screen is presented. also tried last known good configuration, nothing. i have done numerous checks from anther computer, but not sure what to look for or what to fix. i have deleted all the viruses that i could and there were many. is there a way to use system restore or a earlier copy of registry without harming the current computer only the hard drive?

 

first off thanks, glad to be here. let me get right in i dont have a command prompt the comp that i have has swithced hands so many times it has to boot through the cd drive which has files to install properly. there is 3 install methods that i have seen searching through the bios. first it goes to HD0 then to cd rom then to SCSI. i have not tried starting the computer yet since ive removed all the viruses.( are there types of viruses that let comp load but leave a blank screen as described?) in the past ive made a backup of the registry but since no command prompt area i doubt that i can use it. an xp boot disk will most likely be the best sollution. yet again ill have to try these at a later date. i dont have a xp reinstall disk for my computer but i do for other models of the same manufacturer, but that most likely wont help either.

just to be sure i cant restore or edit anything from another computer. with the broken computers hard drive in slave mode?

 

also how can i know if i have all the drivers to run my computer? i see some load during safe mode boot but then it hangs after running a couple dozen or so.

 

cd-rom to hdd to floppy sounds more like what it might of been. again im not near the computer so i wouldnt be able to verify it for you. what im gathering there have been problems in the past with the computer which lead someone to have to add these steps for it to run properly.