Option 1: use sconfig
1. Open a CMD PROMPT as an Administrator
2. Type SCONFIG and press ENTER
3. Type 5 and press ENTER
4. Type M for Manual (or D for Download Only) and press ENTER
If SCONFIG is not available or still shows WINDOWS UPDATES are set to CUSTOM, go to the next method:
Option 2: use LOCAL SECURITY POLICY or GROUP POLICY
1. Click START and type GPEDIT.MSC and press ENTER (or open the GROUP POLICY MANAGEMENT CONSOLE and open an existing GPO or start a new one)
2. Expand COMPUTER CONFIGURATION > ADMINISTRATIVE TOOLS > WINDOWS COMPONENTS > WINDOWS UPDATE
3. Double click on CONFIGURE AUTOMATIC UPDATES
4. Select either DISABLED (equivalent to MANUAL) or ENABLED and select what you would like from the drop down list