I have been trying to post a thread on my school account. I keep getting a message saying:0x7c901010 memory could not be read 0x0000001c application will be terminated.

Can someone please tell me what I need to do??

This is often although not always a symptom of Spyware.

Try this approach first:

http://www.d-a-l.com/help/showthread.php?t=32403

Post a HijackThis log over in that section.

If they give you an all clear and the problem persists return to this thread and we can look further.