Sorry for the delay in getting back to you.
I've been real busy, and we've lost some help here at the forums.
Device Manager tells you if things are updated in relation to Windows Update. This isn't an accurate thing because the driver manufacturer's may not submit their latest drivers to Windows Update. I've been trying this new tool out and you may want to give it a try (don't rely totally on it - but it's worth a look-see): Free Driver Update Software - Device Doctor
Working the minidumps as I type this....
I prefer hanging onto the D: drive. You own the full copy of Vista on the drive - and if your copy of Windows 7 is an upgrade then it's technically necessary to have it to "prove" your entitlement to the upgrade. If the space is crucial, then I'd make the recover disks and format the partition.
Please update this driver: mdmxsdk.sys Mon Jun 19 17:27:26 2006
I think it's associated with your Modem
Nothing significant with the rest of the dump files. I suspect either a corrupt/incompatible service - or malware. Have you scanned the system to see if it's infected?
If you have, please post back and I'll include some instructions for setting up Driver Verifier. We'll see if that will catch the bugger that's causing this.