I am running Windows 98 and recently installed McAffee Virus Scan, having already downloaded McAffee Firewall from the disc in your magazine. However, after installing VirusScan, I found the whole system very slow to start and access to programs was very sluggish. On more than one occasion, the system stopped and I had to shut down and start again. Is this is a problem with my system or McAffee, and what can I do about it ? At the moment I have removed Virus Scan but, obviously, I would like to have this protection as soon as possible.