Did I miss something here?
How are you going to run a computer with bad ram?
Isn't that like asking if its ok to drive your car with a blown engine?
If you already know that your RAM is bad, replace it at once.
Bad ram will (or can) caues your OS to write bad data to your hard drive, corrupting it.
It can also corrumpt program files or data that you use daily.
Blue screens of death (BSOD's), crashes and lock-up's are common bad-ram problems.