Our home computer was infected with the brontok worm/virus and all anti virus software,standalone tools, and programs I've tried have not been able to restore the computer back to its better state. I've tried malwarebytes and stinger, and it solved the problem of the computer restarting by itself every now and then, opening command prompt, and task manager. The only problem that remains is that the computer really runs slow and I cannot install any anti virus software on the computer. Either the program aborts setup or errors occur about the software needing to be re-installed, which I've tried many times but no success there. The computer's a Lenovo 3000 J Series, and runs on Windows XP. I do not have the recovery disc/disk so reformatting the hard drive is not an option, although I might consider it if there's a way to wipe out everything and start off the computer in factory settings by using another recovery disc/disk for other computers. I have saved everything I do not want to lose in my portable hard drive so I'm not worried about losing anything.
When I run standalone scanners, they don't pick up on anything. They do not report any infected files, but I am still not able to install an anti virus software on the computer.
Also my computer cannot start on safe mode. I press F8 on start up and nothing happens. Also tried pressing it repeatedly but still no luck. I'm not an advanced computer user so please keep it simple.
Even if you don't have a full solution, time spent on answering is very appreciated! Thanks!