IE problems checking out

I'm using opencart_v1.5.1.3.1 and I'm getting two errors in IE a step before when I try to continue after clicking to agree with the terms and conditions.

Message: Expected '/'
Line: 10
Char: 8
Code: 0
URI: http://mystore.com/store/index.php?rout ... t/checkout

Message: Could not complete the operation due to error 80020101.
Line: 16
Char: 11799
Code: 0
URI: http://mysite.com/store/catalog/view/ja ... 6.1.min.js

Any ideas? For error 80020101 I found a few threads about how jquery 1.6 might have a possible bug

http://bugs.jquery.com/ticket/9221
http://forum.jquery.com/topic/jquery1-6 ... -bug-in-ie
http://dracoblue.net/dev/could-not-comp ... 20101/137/

Just wondered if anyone else had this problem or could suggest anything to try. We have to have the cart working in IE or we can't launch the store. I could try reinstalling the cart or downgrading to jquery 1.5 I guess.

Any thoughts?

I was unable to find anything to change or how to change it, so I went off a comment in one of the links provided above that said the error didn't occur in jquery 1.5.1

And so, I downloaded 1.5.1 here and tried it and....yes it works.
http://blog.jquery.com/2011/02/24/jquery-151-released/

I hope I have not introduced vulnerabilities or other errors as a result of this.

Any thoughts?

It would help to post a link to your store instead of a useless fake link.