|Thanks for the replies. :)|
It can't be a conflict between my burning program and anything because I uninstalled all the burning programs. I bought this laptop for 90$ from somebody and it was in a complete mess (probably caused by all the shady software installed) since the beginning. I can't reinstall it because I don't have access to the CDs. I'll try installing Ubuntu on dual-boot and see if it works better.
But it really makes me curious what could have caused this anomaly. I got rid of every program that was not essential and did other things to make this laptop work properly. I ran a scan right after it, and there were some viruses in System Restore folder. As far as I know that doesn't mean anything other than the previous owner shouldn't be a computer scientist (but he is) because he can't even be bothered to scan his computer. But otherwise I didn't notice anything notable that could be the reason why my other, equally old computer that I took proper care of is functioning properly, and this one is not. I'm afraid it might actually be the hardware's fault.
But it's not like I expected wonders for 90$, lol.