OS on USB?

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Hi, can you help me out guys? I am having a problem in reformatting my PC. It does not have a DVD-ROM therefore i am relying on the USB OS installation. However, i tried to reformat it for a number of times but i was unsuccessful. Im having driver issues. I tried to follow all of the guides online and I think I am following it correctly. I am getting "______.sys not found" errors. It finds a driver that (i think) is not really needed by my laptop because I use a different brand of hardware. Do you have any tips or suggestions to solve my problem? I really have to fix my computer as soon as possible. I have been encountering problems for so many weeks. I really have to clean this up. Or perhaps do you have any suggestions that would solve my problem? Any programs or pc tools that would help me address the missing files. I think I am doing the right thing, its just that I do not know where to get those drivers or why on earth do I need those?