Which Microsoft Windows Operating Systems Are Supported? - Keithley 2450 Reference Manual

Section 9: Frequently asked questions (FAQs)
8. If the incorrect driver is installed, click OK.
9. On the Driver tab, click Update Driver.
10. Browse for the driver; select the C:\windows\inf folder and you should see the winusb.inf file.
Select this and make sure the driver is now in use.
11. If this does not work, uninstall VISA, unplug the instrument and follow the steps to reinstall VISA
in the section Modifying, repairing, or removing Keithley I/O Layer software.

Which Microsoft Windows operating systems are supported?

Microsoft Windows 2000, Windows XP, Windows Vista, and Windows 7 are supported.
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Model 2450 Interactive SourceMeter® Instrument Reference Manual
Figure 143: Driver File Details dialog box
2450-901-01 Rev. B/September 2013