BSOD following Avast install on Windows 7

Hi, I recently experienced a BSOD following installation of a free Avast program. I received this information in the crash report:


windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
CPU: GenuineIntel Intel(R) Pentium(R) 4 CPU 3.00GHz Intel586, level: 15
2 logical processors, active mask: 3
RAM: 1063239680 total
VM: 2147352576, free: 1990336512



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Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.


On Wed 7/20/2011 1:19:13 PM GMT your computer crashed
crash dump file: C:\Windows\Minidump\072011-27674-01.dmp
This was probably caused by the following module: usbccgp.sys (usbccgp+0x547F)
Bugcheck code: 0x19 (0x3, 0xFFFFFFFF82B75818, 0x50E0C2, 0xFFFFFFFF82B75818)
Error: BAD_POOL_HEADER
file path: C:\Windows\system32\drivers\usbccgp.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: USB Common Class Generic Parent Driver
Bug check description: This indicates that a pool header is corrupt.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. This might be a case of memory corruption. More often memory corruption happens because of software errors in buggy drivers, not because of faulty RAM modules.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system which cannot be identified at this time.


On Wed 7/20/2011 1:19:13 PM GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: usbccgp.sys (usbccgp+0x547F)
Bugcheck code: 0x19 (0x3, 0xFFFFFFFF82B75818, 0x50E0C2, 0xFFFFFFFF82B75818)
Error: BAD_POOL_HEADER
file path: C:\Windows\system32\drivers\usbccgp.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: USB Common Class Generic Parent Driver
Bug check description: This indicates that a pool header is corrupt.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. This might be a case of memory corruption. More often memory corruption happens because of software errors in buggy drivers, not because of faulty RAM modules.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system which cannot be identified at this time.



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Conclusion
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2 crash dumps have been found and analyzed.
Read the topic general suggestions for troubleshooting system crashes for more information.

Note that it's not always possible to state with certainty whether a reported driver is actually responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.

How do I address this problem?
Many thanks in advance,
Felicia
 
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