|I thought those were your specs. What kind of modem is the message referring to? Broadband or dial up? How is the modem connected to the PC? I found the following by Googling.|
If the modem is a dial up and there are no drivers available then I would toss it and buy another one.
That said, unless the modem is using some odd resources, it shouldn't have an affect on an optical drive.
What may be a problem is motherboard chip set drivers. I never heard of "Scholar pc / Sch240060256" so I can't send you to a site to download drivers. What I can suggest is you download and use SIW.exe to determine some specs on the motherboard so you can find drivers.
If the optical drives are IDE ATA/ATAPI interface then go to Device Manager> IDE ATA/ATAPI controllers> primary IDE channel> properties> advance settings. The controller should be running in a DMA mode. If it isn't then most likely the chip set drivers need to be installed. Repeat for the Secondary channel.