I have an older Compaq laptop running on XP. It is still usuable but is getting slower and slower. I have run Malwarebytes and AVC, and also run CCleaner almost dailly, but no infections are found. I'm trying to avoid a full reformat. Could someone suggest some programs to run or a general procedure to clean up HD and avoid a reformat. I know this is a general problem, but I'm running out of options.