Thank you, Shane, you're great.
Here's the report. (I'll wait to hear back from you before I buy the pro version of WhoCrashed, if I can affford it) -- Tim
System Information (local)
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computer name: TIM-PC
windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
Hardware: EP45-UD3L, Gigabyte Technology Co., Ltd.
CPU: GenuineIntel Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz Intel586, level: 6
2 logical processors, active mask: 3
RAM: 8588353536 total
VM: 2147352576, free: 1924296704
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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 Mon 1/20/2014 2:55:27 PM GMT your computer crashed
crash dump file: C:\Windows\Minidump\012014-77579-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x75BC0)
Bugcheck code: 0xD1 (0xFFFFFFFF, 0x2, 0x8, 0xFFFFFFFF)
Error: DRIVER_IRQL_NOT_LESS_OR_EQUAL
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that a kernel-mode driver attempted to access pageable memory at a process IRQL that was too high.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Mon 1/20/2014 2:55:27 PM GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: usbport.sys (USBPORT+0x2F89)
Bugcheck code: 0xD1 (0xFFFFFFFF, 0x2, 0x8, 0xFFFFFFFF)
Error: DRIVER_IRQL_NOT_LESS_OR_EQUAL
file path: C:\Windows\system32\drivers\usbport.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: USB 1.1 & 2.0 Port Driver
Bug check description: This indicates that a kernel-mode driver attempted to access pageable memory at a process IRQL that was too high.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
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 that cannot be identified at this time.
On Mon 1/20/2014 2:13:19 AM GMT your computer crashed
crash dump file: C:\Windows\Minidump\011914-31122-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x75BC0)
Bugcheck code: 0xD1 (0xFFFFFFFF, 0x2, 0x8, 0xFFFFFFFF)
Error: DRIVER_IRQL_NOT_LESS_OR_EQUAL
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that a kernel-mode driver attempted to access pageable memory at a process IRQL that was too high.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Sat 1/18/2014 4:17:20 AM GMT your computer crashed
crash dump file: C:\Windows\Minidump\011714-49233-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x75BC0)
Bugcheck code: 0xD1 (0xFFFFFFFF, 0x2, 0x8, 0xFFFFFFFF)
Error: DRIVER_IRQL_NOT_LESS_OR_EQUAL
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that a kernel-mode driver attempted to access pageable memory at a process IRQL that was too high.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
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Conclusion
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4 crash dumps have been found and analyzed. No offending third party drivers have been found. Consider using WhoCrashed Professional which offers more detailed analysis using symbol resolution. Also configuring your system to produce a full memory dump may help you.
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.