It's one year old.
Toshiba Satellite Pro L300
Dunno about OS, I get it from my dad so. :S
Ever since I got it.
93 (i think thats bad)
most of RAM is free.
yes, the system scan picked up nothing,
Hope this helps.
I've done a quick research on Google, and it seems the freezing is a common problem. But, anyway, does the menu bar only freeze? Does it happen randomly, and even if you're doing nothing? Oh, and what scanner(s) did you use? You got the latest updates, isn't it?
EDIT: If you don't know what the OS is, you can open a program such as Paint or Notepad and load the About dialog from the Help menu.