memory could not be written

[C++ Programming]

Hello my friends:
Sometimes I start my program , I get an error message saying: The instruction at "0x766fbb8f" referenced memory at "0x2f7a6e2e"(this number vary). The memory could not be "write". It usually have the option to press ok to terminate the program, or cancel to debug.

The error message follow:
First-chance exception in cloud.exe (WININET.DLL): 0xC0000005: Access Violation.

Ordinal103+0x710e
wininet ! InternetTimeFromSystemTimeA
wininet + 0x4b1b
wininet + 0x497c
wininet ! InternetTimeFromSystemTimeA + 0xd085
wininet ! CommitUrlCacheEntryA + 0xd1
wininet ! InternetClearAllPerSite******Decisions
wininet ! Ordinal117+0x7f2
wininet ! InternetTimeFromSystemTimeA + 0x7b39
wininet ! Ordinal101+0x592
wininet ! Ordinal101+0x24b
wininet ! Ordinal101+0x142
wininet ! InternetGetConnectedStateEx + 0x128
wininet ! Ordinal120+0xbf
ntdll ! RtlSetEnvironmentVariable + 0x30a
ntdll ! RtlSetEnvironmentVariable + 0x34b
ntdll ! RtlSetEnvironmentVariable + 0x40d
ntdll ! RtlSetEnvironmentVariable + 0x3e4
Kernel32 ! GetModuleFileNameA + 0x1b4

Because I use cwebbrowser2 in my application. Sometimes IE6 browser also get an same error message above.
I would appreciate any help.