How to remove Perfect Keylogger

We have an older Dimension 8250 which has been running awful so yesterday I installed Webroot Spy Sweeper on it and did a scan and it found a copy of Perfect Keylogger.  I quarantined it but would like advice on how to remove it (i.e. what program would be best, etc. to do this).  I have found instructions on the internet for manual removal but do not feel I have the technical know how to even attempt doing this...any advice would be welcomed!!!  Also..is there any way I can find out just WHERE the information is being stored at..either on the net or on the computer (or some other computer)??