Processor: Intel Core 2 Duo E6420 2.13 GHz

Memory: 2x1GB GEIL 800Hz DDR2

Graphic card: NVIDIA GeForce 9800 GTX+ 1024MB

MoBo: GIGABYTE 965P-S3

HDD: SAMSUNG 60GB (for Windows 98)

Which drivers are needed to start Windows 98 normally?

P.S Sorry for my bad english, i use translator.

No. A graphics card with 1024 MB is almost impossible to use with 9x/ME, and, moreover, nobody ever got a GeForce 9800 to work with 9x/ME.

Downgrade to a FX 5200, and all should work. With your present graphics card, forget it: it just won't work. I sorry.

Even in VGA mode will not work? Do I just a system does not allow for more amount of video memory?

See: nVidia GeForce and Win 9x/ME - Relevant Threads

Even in VGA mode will not work? Do I just a system does not allow for more amount of video memory?

VGA Mode will probably work, but I can't guarantee it.

The 2GiB of RAM will definitely crash Windows 98 unless you Patch it or limit it.

There are some unofficial graphics drivers for the 8xxx series.