HTC Desire S: How to upgrade to ICS (Ice Cream Sandwich) android version
http://www.htcdev.com/devcenter/downloads
The RUU (ROM Upgrade Utility) is an all-in-one package. This is how I use them...
1. Make sure HTC Sync is installed on the PC
2. Go to Settings>Power and make sure 'Fast Boot' is not ticked
3. Turn the phone off
4. Turn it back on whilst holding the volume down button to get to a screen with HBOOT on it (and 3 green Androids at the bottom)
5. Using the volume buttons select 'FASTBOOT from the menu and press power to select. The screen will change to say FASTBOOT
6. Connect to the PC and wait for Windows to install the drivers
7. Once the drivers are done, run the RUU and follow the instructions (at places where it says 'plug the phone in' ignore as it's already in)
8. It'll take about 10 minutes so just wait! 
I had that several times before it worked. Here's what I did though....
1) Disable any anti-virus software running on the PC
2) Make sure USB Debugging is checked (as above)
3) Uncheck Fastboot (as above)
4) Power down the phone.
5) Press Power and Volume down
6) Enter Fastboot
7) Run the RUU
8) Follow the instructions
9) Go off and make a cup of tea
10) Sit and stare at your monitor and phone repeatedly.
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