Not booting

I tried to install drivers for a WiFi card following the steps found because my device is not autodetected. I had to create a file for boot.conf at /boot. Now I can not boot, it reboots again and again in a loop, it says it will reboot in 15 s. I have no way to enter the system, it is the only system at the laptop. Have I any choice apart from reinstalling? Anything like safe mode or similar?
 
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