BleepingComputer.com: TDSS.ASZ malware in Vista

Hello,

This is my first post on this site and I hope you guys can help me. OS is VHP, problem is malware. I've looked in other posts on this site but cannot get past one of the recommended steps.

Here's what's happening.

Computer BSOD and reboots every 10 mins.
Kaspersky finds tdss.asz and tdss.atb but cannot delete.
Go into Safe Mode with Networking and PC doesn't reboot - all good. Try going onto Internet and cannot download Malwarebytes using IE or Firefox. I loaded it onto usb stick, renamed exe files and it found and deleted tdss. Came back on reboot. This is when I checked the forums. It said to disable tdssserv in device manager but the option is greyed out. This is where I'm stuck. Cannot install SDfix as it says it's only for XP and 2K. Cannot install Combofix as I get error 'Windows cannot find 32788R22FWJFW\nircmd.com'. This is all happening in Safe Mode because it's the only way I can make the PC stable. I removed Kaspersky (on their advice. I know I should've stopped services). I have admin rights but the tdssserv is still greyed out even in normal PC mode. All other options in hidden devices in device manager have the option to disable, etc;

Dr Web you are the BEST!!
Ran it, never come across it before, computer's been up for 30mins - so far so good. Now to get Kaspersky back on.