Problem signature:
Problem Event Name:APPCRASH
Application Name:YahooMessenger.exe
Application Version:10.0.0.1270
Application Timestamp:4c053ffe
Fault Module Name:ntdll.dll
Fault Module Version:6.0.6002.18005
Fault Module Timestamp:49e03821
Exception Code:c0150002
Exception Offset:00009eed
OS Version:6.0.6002.2.2.0.768.3
Locale ID:1033
Additional Information 1:9d13
Additional Information 2:1abee00edb3fc1158f9ad6f44f0f6be8
Additional Information 3:9d13
Additional Information 4:1abee00edb3fc1158f9ad6f44f0f6be8

I tried uninstalling it multiple times and download it again...but it still crashes. Please help.