Well, apparently one or more of those services is required by SU, because it crashes while it tries to download the update package. I verified this by re-enabling the 49 servers, and SU started working fine again.

Here are the services I disabled. Before I start narrowing down the list, does anyone already know which services SU requires? Or at least a way to check which services are needed? I poked around in Vista's event log and didn't find anything useful.
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Application Layer Gateway Service
Application Management
Computer Browser
Distributed Link Tracking Client
Distributed Transaction Coordinator
Function Discovery Provider Host
Function Discovery Resource Publication
IKE and AuthIP IPsec Keying Modules
IPS Core Service
IPsec Policy Agent
Microsoft iSCSI Initiator Service
Netlogon
Offline Files
Parental Controls
Peer Name Resolution Protocol
Peer Networking Grouping
Peer Networking Identity Manager
PNRP Machine Name Publication Service
Portable Device Enumerator Service
Print Spooler
Problem Reports and Solutions Control Panel Support
Program Compatibility Assistant Service
Quality Windows Audio Video Experience
Remote Access Auto Connection Manager
Remote Access Connection Manager
Remote Registry
Server
Shell Hardware Detection
SL UI Notification Service
Smart Card
Smart Card Removal Policy
SNMP Trap
SSDP Discovery
Tablet PC Input Service
TCP/IP NetBIOS Helper
Telephony
Terminal Services
Terminal Services Configuration
Terminal Services UserMode Port Redirector
UPnP Device Host
WebClient
Windows Image Acquisition (WIA)
Windows Media Center Receiver Service
Windows Media Center Scheduler Service
Windows Media Center Service Launcher
Windows Media Player Network Sharing Service
Windows Remote Management (WS-Management)
WinHTTP Web Proxy Auto-Discovery Service
Workstation



