Execute a ferramenta PCI-Z para ver quais dispositivos você tem no PC.
PCI-Z is designed for detecting unknown hardware on your Windows based PC. It will help you determine vendor, device and certain details about device even if you don't have drivers installed. Software uses The PCI ID Repository, a public repository of all known ID's used in PCI devices: ID's of vendors, devices, subsystems and device classes. It is used in various programs (e.g. The PCI Utilities) to display full human-readable names instead of cryptic numeric codes. It is almost similar to lspci Linux command but with full Windows support.
Agora, vá para as homepages do fornecedor (relacionk, broadcom, nvidia) em um segundo PC para obter os drivers. Transfira-os via unidade flash USB para o PC e instale os drivers que faltam.