Ntoskrnl.exe Vista 64 BSOD help

Hi Everyone. I'm having a huge problem with a BSOD that will only allow me to boot normally maybe once out of 10 attempts though I can always boot into safemode.

Specs:

Dell Studio 1737
Windows Vista 64 Home premium Service Pack 1

Ive tried:

System Restore
Updating Dell drivers
Repeated Virus Scans

Bluescreen viewer shows a ntoskrnl.exe+a8761 in almost all crash stacks.

What should I do to get rid of this issue? I'm really stuck here and could really use some help.

Here are my Minidumps
 

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