cannot connect to secure web sites

I am running win98, internet explorer5.01sp1,
sometime in the last week I now cannot connect to websites that say I am entering a secure connection,I tried changing my ie security settings to low but this did no good, I had the settings very restrictive, I have 2 other pcs on my home network and they can access the sites fine,any ideas where I should start to troubleshoot or what is wrong? I am sure it is something stupid I did but I need help….
thanks