Nvidia is your graphics card so don't delete those drivers. ;)
And I wouldn't uncheck NvCpl, nwiz, or NvMcTray on the Startup tab in msconfig. Unchecking those will disable many of the features of the nVidia graphics card and bliock any custom settings that may have been made for personal screen preferences (eg, performance, quality, refresh rate, brightness, contrast etc).
SoundMax is typically on-board audio builit into the motherboard. The most common add-in PCI sound cards are from Creative Labs such as their Soundblaster, Audigy, Xtreme, etc. So do you recognize any of those names? Can you check the original component spec sheet that came with the PC to see what audio card you have?