Security Warning Message

I have IE7 and Windows XP. I scanned my system and to my suprise I had plenty of trojans. I purchased Antivirus Plus and installed it on my system to get rid of the viruses. It did the job, but now I can't get on my webpage so that I can work from my home like I use too.
I am getting this error message: Security Warning do you want to view only the webpage content that was delivered securely? This webpage contains content that will not be delivered using a secure HTTPS connection, which could compromise the security of the entire webpage. YES NO
No matter if I choose "yes" or "no" the webpage will not come up.

Also when I get on the Internet and click on some of the links I get this message:

Insecure Internet activity. Threat of virus attack
Due to insecure Internet browsing your PC can easily get infected with viruses, worms and trojans without you knowledge, and that can lead to system slowdown, freezes and crashes. Also insecure internet activity can result in revealing your (the message then cuts off)

This was not happening before I downloaded the Antivirus Plus. It got rid of the trojans, but I think it caused other problems that I don't know how to handle. Can anyone give me some info that I could try to resolve my problem??

 

I may have messed up!! They only give me witabtt.com. I googled that webpage and there were links that was saying bad things about the software. I could not open the links because I would get the message "Insecure Internet activity. Threat of virus attack" I suppose to have 30 days trial where I can return and get my money back!!!

I have to go to work now, but I will check with you when I come back this evening.

Thanks