Trackir should appear as an 'unknown device' in Device Manager (Right-Click 'Computer', select 'Manage' then select 'Device Manager' under 'System Tools'). All I did was to install the appropriate version of the TIR software then right-click the 'unknown device' and select 'Update driver'. Win 7 did the rest for me.
Win 7 should detect the X52 OK, but there are no native (built-in) drivers for it, so d/l the appropriate driver from Saitek (make sure you get the 64-bit one if you're on 64-bit Win 7 - same applies to the TIR s/w), install it and then the X52 should pick up OK. The Saitek SST has also been updated for 7, so that works too.
Incidentally, all this works with UAC on.
Jabo