ere's a list of the keys in the registry that the install will look to try and remove (but sometimes can't due to system specific problems).
Click Start>Run, type
regedit
and then click OK.
Click the plus sign next to HKEY_LOCAL_MACHINE and then look for each of these folders (highlighted in bold at the end of each string) and delete them if you find any of them.
Software\Microsoft\Windows\CurrentVersion\Uninstal l\Saitek Gaming Extensions
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{167E4A06-F407-11D3-95F5-0080AD910D79}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{1bfde623-95c2-40b4-ad14-224afc590dec}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{1d639238-eddf-4a28-8ad7-82744af5bc34}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{76da7051-7a5d-4bd7-9e05-7a4014d3e905}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{3a9e0e2f-b0d1-452b-b833-7a7300ea1231}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{90126b79-c0d2-41a5-86b2-2f6666c446b9}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{40B3A7BB-0D2C-4BC4-B7AA-C326A5793C21}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{03adca1c-bcf0-4b12-afcf-8ebf2cb3ab07}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{655ee3b7-0113-4c5e-b147-b82ba325643f}
Software\Wow6432Node\Microsoft\Windows\CurrentVers ion\Uninstall\{655ee3b7-0113-4c5e-b147-b82ba325643f}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{DC431222-E2D0-4C4A-9438-52D4626202B3}
Software\Wow6432Node\Microsoft\Windows\CurrentVers ion\Uninstall\{DC431222-E2D0-4C4A-9438-52D4626202B3}
Software\Microsoft\Windows\CurrentVersion\Uninstal l\{967FB80D-56BD-42EF-A942-9E8C78F984A4}
Software\Wow6432Node\Microsoft\Windows\CurrentVers ion\Uninstall\{967FB80D-56BD-42EF-A942-9E8C78F984A4}
Once you've done that, you should be able to install with no trouble.
__________________
Best Regards
Richard Neville
PC Gaming Category Manager
Saitek UK