hijacked??? not sure

what happens when your comp has been hijacked. I wanted to post here before I go to security forum. There is activity on my comp which I did not perform. Eg. Someone is attempting to access my email account from the other end of the country, activities that I know i did not perform. I ran norton security on it and it results clean or problem has been removed but the records in the security check provides me with a long list of attempts on my computer. I have the IP addresses I kept them in case they become of use. I,m sure it's not a virus, the activity is human related. What do I do. Also when I log on, it shows I logged on from British Columbia which is across the country from where I live. When I change my password, it shows I changed my password, but from B.C.

 

Thank you Triple6.....what I forgot to mention is my os is windows 7 home premium 32 bit.

 

Please elaborate on those.

 

I went to www.whatismyip.com. the ip from B.C. activity is not my ip displayed at the link. The activities I am referring to are simple log on(s), for web browsing. It seems to me that everything i do is automatically recorded in my security check list. It's my location that bothers me, I am not located in B.C. I'm going to check my IP again later to see if it remains the same (static) or it may change. But the IP in my security check is much different from mine. I also contacted my ISP maybe they will have an explanation for me

 

So you are saying that you found logons to your PC is from another IP ? Where did you find that?

And what is your security check list ? Is it a program?

 

Yes, the ip that logged on from B.C. had a long string of (digits, numbers, letters) like about 16, maybe even 20, I didn't count, that are not anything close to my ip which has only afew, like about 208, xxx,xxx, that's it. but I just noticed something since I posted, everything I do, it syncs/shows up in my gmail check list as being performed exactly the same time I logged on, performed anything on my comp. eg. just going to websites in general. So I'm seriously thinking about what Triple 6 is saying (above), maybe that's what it is, when I run my virus scan (Norton) it comes clean.....

 

right now I'm not at home, I am in Winnipeg only for 5 days then I will be back home with my own PC. I'm not all that savy about all this, what's PM, I would like to send you the IP from B.C. and mine for comparison in private but how do I do that..........oh, and now I am using my daughters laptop, am not at my desktop. Those security checks I ran were through gmail that's where I found all these messages about what I felt were strange activities.....