My PC may have had malware/virus/spyware in the past so that may have been the reason for the significant reduction in speed. Refer to this thread for background info: https://www.techspot.com/vb/topic149117.html However, the assister presumed my slow PC wasn't due to the cause of having malware because the logfiles were clean in the end. Nevertheless, every time I start up the computer it can take up to 5 minutes for me to begin opening new programs like IE, but then I would have to wait for maybe up to 4 minutes until the program finishes opening up and wait a little while more to be able to click the address bar and start typing. Generally, before I may be able to start a new program, the computer freezes for a little while. I've recently deleted all the unnecessary documents, music, pictures to free up more space and manually deleted infected-SmartShopper files (see thread) but the PC has gotten even slower. If my PC has a capacity of 111GB and 68.8G of free space, my computer shouldn't be running too slow. I have SP3, should I delete some Windows XP updates, if so, which? Also, the PC freezes up every time during a HiJackThis scan so it's pretty impossible to provide a logfile.