I assume you have a Catalyst 3500XL (either a WS-C3524-XL, WS-C3512-XL, WS-C3548-XL or WS-C3524-PWR-XL) and NOT a Catalyst 3550. These switches are pretty old now (End of Sale July 2002 & End of Support July 2007) and only have 12.0x IOS available. I have checked and the most current IOS release is 12.0(7)WC17 which was released very recently (February 23 2007).
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