I can't for the life of me find thefragged entrance to the undercellar.
I want my balduran's cloak :mad:
would some please assist, many thanks.

You can enter the Undercellar either via the sewer tunnels (accessable from the part of the city where the Elfsong tavern is if I remember right).
Another (better) option is to go the Blushing Mermaid Inn (on the east side of BG City) and through a back door there. You come right to it that way, without crawling through the sewers first.

Appreciations my good sir, I looked in the square where the map stated and found nothing. I thought of the sewers, but when I tried to enter them by the market aquare i kept getting an error that went back and forth between disk 4 & 5 on a blue screen.

Did you install the patches for the game?
Get them at http://www.sorcerers.net/Games/BG/index_misc.htm if you haven't already. Should fix some of your problems.

Go to the blushing mermaid

I checked the version on my game, its alreadt got the patches installed. when I tried to install the patch at first it caused more problems than I had before.