BSOD - just after login, please help

The perfmon report says that this device is disabled:

Broadcom NetLink (TM) Gigabit Ethernet

Did you deliberately disable it? If so, why? (it's a laptop, so you may not need it?)

4 memory dumps with 4 different BSOD errors and 2 different causes.
This is probably a hardware problem, but could also be a compatibility issue.

I'd start by running these free hardware diagnostics:

H/W Diagnostics:
Please start by running these bootable hardware diagnostics:
Memory Diagnostics (read the details at the link)
HD Diagnostic (read the details at the link)

Also, please run one of these free, independent online malware scans to ensure that your current protection hasn't been compromised: Malware (read the details at the link)

I would check your hardware and software for compatibility at this link: Windows 7 Compatibility: Software Programs & Hardware Devices: Find Updates, Drivers, & Downloads

BSOD BUGCHECK SUMMARY

Code:

Built by: 7600.16617.amd64fre.win7_gdr.100618-1621
Debug session time: Sun Oct  3 04:42:04.465 2010 (UTC - 4:00)
System Uptime: 0 days 0:31:00.258
BugCheck DE, {2, fffff8a011c6cc58, fffff8a011c6ab5b, 870b28c0}
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+2d260 )
DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT
BUGCHECK_STR:  0xDE
PROCESS_NAME:  System
Bugcheck code 000000DE
Arguments 00000000`00000002 fffff8a0`11c6cc58 fffff8a0`11c6ab5b 00000000`870b28c0
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16617.amd64fre.win7_gdr.100618-1621
Debug session time: Sat Oct  2 03:42:14.861 2010 (UTC - 4:00)
System Uptime: 0 days 0:08:26.486
Probably caused by : Ntfs.sys ( Ntfs!NtfsQueryNameInfo+274 )
DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT
PROCESS_NAME:  spoolsv.exe
BUGCHECK_STR:  0x24
Bugcheck code 00000024
Arguments 00000000`001904fb fffff880`021c5e28 fffff880`021c5690 fffff800`01a924b4
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16617.amd64fre.win7_gdr.100618-1621
Debug session time: Thu Aug 26 12:48:09.077 2010 (UTC - 4:00)
System Uptime: 0 days 2:08:19.702
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+33906 )
BUGCHECK_STR:  0x1a_41790
DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT
PROCESS_NAME:  devenv.exe
Bugcheck code 0000001A
Arguments 00000000`00041790 fffffa80`034061d0 00000000`0000ffff 00000000`00000000
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 7600.16539.amd64fre.win7_gdr.100226-1909
Debug session time: Tue Aug 10 02:46:23.730 2010 (UTC - 4:00)
System Uptime: 0 days 0:39:00.354
Probably caused by : ntkrnlmp.exe ( nt!ExFreePoolWithTag+17f )
DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT
BUGCHECK_STR:  0x50
PROCESS_NAME:  System
Bugcheck code 00000050
Arguments fffff900`00002a28 00000000`00000000 fffff800`01bb722f 00000000`00000007
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``