I took a look at the Event Viewer, and the Problem Reports and Solutions, and here is what I found:

Description
A problem caused this program to stop interacting with Windows.

Problem signature
Problem Event Name:    AppHangB1
Application Name:    perl.exe
Application Version:    5.10.0.1004
Application Timestamp:    48bef0d8
Hang Signature:    6b71
Hang Type:    0
OS Version:    6.0.6000.2.0.0.768.3
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Does anyone have any ideas about why it hangs perl.exe or how to fix it? Thanks.