Hello there. The anti-virus programs available today for n73 ****, meaning they're almost useless.
What you need to do is format your phone memory. That'll get rid of all viruses stored, and probably fix that "restart" problem you've been having (unless it's a hardware problem). Remove your memory card before you do so first.
- turn phone off.
- hold the following keys WHILE its turning back on: (3 + * + green call key)
- do not let go until it asks you about your location
After you've formatted your phone memory, all viruses will be gone, and it'll be functioning a lot smoother than before.
Next, you've got to scan your memory for viruses by hooking it up to a computer, and then use that computer's anti-virus (has to be updated) to eliminate all those pesky viruses.
Then you could also run a "scan disk" using the computer's "scan disk" feature to make fix any errors on the memory card. You could also choose to defrag the mem card if you like, just to make it respond faster.
As for the loose memory card slot, you're going to have to bring it to a technician to have it fixed. Shouldn't be that expensive.
Or you could put a small piece of tape on it, that is if you feel like getting primitive. :)
Let me know how it goes