Runtime errors on Yahoo mail

I have Dell Laptop 2650 XP Home Ed. Internet is DSL. * I have 7 Yahoo addresses 4 for organizations and the other 3 are 1 - is for getting info from websites (SPAM collector), 2 - General Email, 3 - for resumes etc... family doesn't even have this address.
6 of them work fine, Spybot S&D lets me know if anything is not right. On my General Email I sign in and am hit with 38 RUNTIME ERRORS.
(this asks "Runtime Error line number ###" do you want to debug? I have answered YES and NO to all and it makes no difference)
Once passed these I go through the same 38 RUNTIME ERRORS before I can check the inbox. When I open a msg. I go through 38 RUNTIME ERRORS read the msg. go back to get the next and see 38 RUNTIME ERRORS the interesting thing is Spybot does not pop-up in this Email address. Of the 38 all but 6 are "Yahoo is undefined" several repeat lines

1 is - Expected "}", 186 - "GxStrings is undefined", 474 - "Object expected" this is repeated, 762 - "Object is expected"

Lines - 152, 202, 220, 225, 225, 244, 249, 249, 315, 318, 386, 386, 390, 390, 394, 416, 477, 477, 480, 480, 482, 482, 485, 485, 581, 605, 609, 681, 681, 685, 685, 696, 696, all are "Yahoo is undefined" And NO I did not repeat the line numbers to see if you are paying attention this is the way it happens.

Once in a while 315 - "Form0 is undefined". 315 shows up when logging into banking websites as well.

I have Antivir and Spybot S&D

I don't use this computer as my main internet machine

Thanking you in advance

Madhouse 57

 

If you're using IE...

http://support.microsoft.com/kb/308260/en-us

 

Thank you for the site. It did finally prove to be useful and I did find out the problem and you helped me solved it.
Thank you
Madhouse57