illustrator crash on startup, exception processing error.

[amanda....@gmail.com]

hi!~
every time I run illustrator I get an error and it shuts down.
The error is, "Windows - no disk Exception Processing Message c0000013
Parameters 75b6bf9c 4 75b6bf9c "
What can I do to fix this??

and the error data is
<?xml version="1.0"?>
<!DOCTYPE crashreport SYSTEM "AdobeCrashReporter.dtd">
<crashreport version="1.1" crVersion="3.0.20080806"
applicationName="Adobe Illustrator CS4" applicationVersion="CS4"
build="367">
<time year="2009" month="4" day="22" hour="13" minute="46" second="27"/
>
<user guid="3f6f3bba-bcef-4908-86c3-3e59a6851b4d"/>
<system platform="windows" osversion="6.0.6001 SP 1.0"
applicationlanguage="English (United States)" userlanguage="en_CA"
oslanguage="en_CA" ram="2037" machine="Intel(R) Core(TM)2 Duo CPU
T7100 @ 1.80GHz" model="x86 Family 6 Model 15 Stepping 13"
cpuCount="2" cpuFreq="1795 MHz" busFreq="" locale="English (Canada)"/>
<crash exception="EXCEPTION_ACCESS_VIOLATION"
instruction="0x686d2837">
<backtrace crashedThread="0">
<thread index="0">
<stackStatement index="0" address="0x686d2837"
symbolname="AGMInitialize"/>
<stackStatement index="1" address="0x777c8652"
symbolname="RtlTryEnterCriticalSection"/>
<stackStatement index="2" address="0x90909090" symbolname="unknown"/>
<stackStatement index="3" address="0x850ff685" symbolname="unknown"/>
<stackStatement index="4" address="0x00013bf1" symbolname="unknown"/>
<stackStatement index="5" address="0x00e67d80"
symbolname="std::_Init_locks::operator="/>
<stackStatement index="6" address="0xb3ff0b74" symbolname="unknown"/>