Cannot add lyrics or artwork to songs 12.1.2

Hi,

After my latest ITunes upgrade (or two) I found I am unable to open ITunes, go into music, pick a song (usually mp3 - of my own - not bought through ITunes), hit "get info", and add artwork or lyrics on my own. I know others online with this problem, but can find no solution.

I was just able to do such editing a month ago; posts I have read on other sites are old and futile, suggesting mini lyric (I don't need scrolling lyrics - just descriptions of DJ setlists, talk show rundowns), etc.

Can I safely revert to an older ITunes? Or is there a way around my new problem? This is my first time joining this community so I'm sorry if this is beating a dead horse, but I've searched and googled high and low, and tried suggestions from unknown sites in this sea of advertising we call the internet (no offense, marketers). Now I hope here I can find and answer.

Thank you.

Running

Operating System

Windows 7 Home Premium 64-bit SP1

CPU

AMD Athlon II X2 260 22 °C

Regor 45nm Technology

RAM

4.00GB Dual-Channel DDR3 @ 535MHz (7-7-7-20)

Motherboard

eMachines ET1352G (CPU 1) 37 °C

Graphics

*22W1* (1680x1050@60Hz)

256MB NVIDIA GeForce 6150SE nForce 430 (Acer Incorporated [ALI])

Storage

596GB Hitachi HDS721064CLA SCSI Disk Device (SATA) 39 °C

1863GB Hitachi HDS722020ALA330 USB Device (USB (SATA)) 61 °C

Optical Drives

HL-DT-ST DVDRAM GH60N SCSI CdRom Device

MagicISO Virtual DVD-ROM0000

Audio

Realtek High Definition Audio 😕