Spyware - Help!

Away on business for a week, sorry I couldn't respond.  I logged on this morning and tried the combofix after being prompted to download the new version.  Seconds after starting it said that access was denied and an administrator (command or password) was needed.  It then tried to find a retore point and hung as usual.  To make matters worse I continued "surfing" afterwards and the "Security Shield" malware popped up again.  I'm writing this under safe mode with networking.  By the way, on your last instruction I didn't understand what you meant about closing the dos window.

[Microsoft MVP/Consumer Security]

I don't think we can fix this
your best bet is to format & reinstall windows

I might have further information before you give up.  I scanned with Trend Micro and it found the trojan RKTK_ZACCESS.FP   You said earlier that it was probably this.  Trend can't fix it but says the infected file is Desktop.ini   The folder path is  C:\Windows\assembly\GAC_32\  Does this help at all?

[Microsoft MVP/Consumer Security]

there will be a lot more than that wrong with this one
when combofix is blocked form running with zero access rootkit, it generally means that so many vital system files have been altered or changed or infected that reinstall is the only viable & safe option