Passat (B5) :: CEL Accompanied With Engine Codes

I just got a 2000 V6 Passat Wagon. The CEL light was on when I got it though I bought it knowing this. The battery was bad when I got it and I replaced it. After installing the new battery . . .. . starting worked only intermittently. It got worse and at one point I had to hold the key to the start position for about 5 seconds before the starter would even engage. Now it won't start at all. I pulled the codes (shown below) when I first got it but did not give it much credence . . . I wanted to clear the codes and drive it and re-look at the codes. . . . but I have not been able to drive it.

Other observances. . .. not sure if they are related to the car not starting:

Windows, sunroof do not roll up/down while electronic locks work. The driver side window was down when I got it and I read somewhere on this forum to use the key to raise it. . .. it worked. Alarm does not work. Radio works. . . . I found it odd that though the battery was taken out for more than 12 hrs. . . . The radio code was not required. Dome light works intermittently.

I have checked every fuse and they are all good.

Engine Codes:
18032P1624MIL Request Sign.active
18011P1603Internal Control Module Malfunction
18010P1602Power Supply (B+) Terminal 30 Low Voltage
16684P0300Random/Multiple Cylinder Misfire Detected
16690P0306Cyl.6 Misfire Detected
16686P0302Cyl.2 Misfire Detected

Transmission Codes:
17142P0758Shift Solenoid B Electrical
18158P1750Power Supply Voltage Low Voltage