Try the fix in the following discussion.
- Gmail presents a banner stating I'm running an old version of IE, which is quite false. Why and what's Gmail's problem?
http://www.google.com/support/forum/p/gmail/thread?tid=6935d3b9d78fda01&hl=en
Joey
CCNA, MCSA 2003, MCP, A+, Network+, CWTS