Only uninstalling will not help speeding up the computer. There are few other things you can try which might help speeding up the old machine.
Update all the device drivers to the latest one available on the Internet.
Perform a Disk Cleanup on the drive containing the OS, that is your C: drive.
- Do a Disk Defragmentation using the Disk Defragmenter program that is available on Windows. Or you can try out other free defragmentation tools that are available on the Internet.
- Run msconfig and disable unwanted Services and Startup Items.
- Uninstall all those unwanted programs. You can do this without Revo.