Windows 7 randomly freezes, sometimes starts up without Desktop

Today I plugged in my external Sata RAID Box, where all my Data is saved. On startup Windows took really long and now in the event viewer I get a bunch of

A timeout (30000 milliseconds) was reached while waiting for a transaction response from the <service> service.

3 times for the ShellHWDetection service and the one time the LanmanServer service.

I checked the forums and some suggest to simply change the timeout period in the registry, I don't think that solves the problem though. I'm running a Malware and Microsoft Security Scan on that drive and so far nothing shows any problems. Do you have other ideas?

It's good to run a Malwarebytes full scan on the drives. I'd also run Partition Wizard Partition surface test on each and Partition Wizard Check File System to check the condition of the HD's and the file system.

Why is your external HD arrayed in a RAID? I would unRAID them, wipe the Diskpart Clean Command
to clear the boot sector of any code that might be interfering, and copy back on the data to a Logical unRAIDed partition. This often works when an added HD slows down boot or interferes with performance.

This is where all my important Data is stored. I use a Startech SAT3540U2E with 4 hard drives in it combined as a RAID10.

Startech SAT3540U2E 3.5-inch 4 Drive eSATA USB Multi Bay External Hard Drive Enclosure: Compare Prices, View Price History and Read Reviews at Nextag

Ok, I will mark this now as solved.
It seems after monitoring my system for a few weeks thoroughly that it is running fine. Most of my applications are back installed and I have no problems. My external RAID got formated as well. There might have been indeed a broken MBR.
The biggest issue was the graphic card.

I still get the DCOM errors and wasn't able to fix it so far.
I know it's the "Profile Notification Host" and with component services I should be able to fix it, but I can't change any settings for my DCOM Config. Identity is set to "Launch by user"..

I keep looking. Everything else is fine.

Thanks Greg, you've been a tremendous help.