Is my computer hijacked?

My computer is under attack. It is very slow.

The second email welcoming me and advising to read first came up as "Internet Explorer cannot display the webpage" and in the address line was: http://%22http//forums.majorgeeks.com/showthread.php?t=35407"]READ",,-1,0,,,,

It seems that Internet Explorer gets redirected. Have run AVG 2012 and Malwarebytes in Safe Mode, CCleaner, SmartDefrag, SUPERantispyware. I used CCleaner to turn off unneeded Startup programs. I removed and downloaded latest Jave and disabled most Add-ons. I tried turning off System Restore but got "Encountered problem disabling one or more drives".

May be of interest: When I last ran Malwarebytes quick scan it ran thru 6 minutes of c\documents & settings\networksercive\local settings\temporary internet files\content.IE5\ files despite having just run CCleaner.

Obviously I need help on this AMD based machine running Windows XP HomeEdition Version 2002, Svc Pk 3. Thanks for any help you can offer.

Forrest Mc

 

Computer is running much faster. I changed browsers and did all but one of the requested items on the lists. I could not unzip/run rootrepair. Winzip gave me an error 1722 code. Also, when I did an AVG uninstall I got an error code 0XE001D02B. A search for AVG shows tons of files still.

I turned Windows Firewall back on but haven't tried to reinstall AVG, fearing problems.

 

I neglected to add: Rootkit.Boot.Pihar.b was detected and cured with SUPERantispy scan. The scan log is gone, however.