4. a user reports slow system performance on her windows 2000 professional computer with 64 mb of ram and 100 mb free disk space. which of the following will improve performance?
a. add the user to the power users group.
b. set the total paging file to use 75% of physical memory.
c. use disk cleanup to remove temporary files and unnecessary program files.
d. ensure that the performance option for the computer is optimized for background service.
answer：c
5. a user downloads an updated device driver for his windows 2000 professional computer and asks for assistance installing it. you are unsure of the source of the driver, and don’t want the user to be unproductive for many hours if the installation causes unforeseen problems. how should you install the driver?
a. save existing driver files to a directory on the computer. install the new driver and reboot. if you encounter problems, reboot to the last known good configuration.
b. install the driver. backup the registry. check the device manager for any conflicts. reboot if none are found.
c. view the advanced properties of the driver file. check for an official signature on the file. install the driver if you find a signature.
d. run a file signature verification survey to verify that the driver is digitally signed. do not install if no digital signature is found.
answer：d
