My mother asked me whether or not I could disinfect her laptop, because she had tons of problems with the worms and trojans feasting upon her system. I agreed to disinfect all the problems, and started to work. I have made a successfully sweep through the laptop with Spybot Search & Destroy, MalwareBytes, and Uniblue SpyEraser. The system is clean as can be.
The problem is, after the disinfection progresses, the laptop became extremely slow. When it was infected, it was, like, 1000 times faster. Now I need to wait 7-8 minutes to even open "My Computer", not to mention the applications. If I click on the icon many times, as you can expect, there'll be 7-8 windows opening suddenly. The same goes for closing a windows, logging in, or shutting down - everything became extremely slow. This doesn't make any sense...shouldn't be the computer slow WHEN it was infected and not after that? I tried Uniblue SpeedyUpMyPC, it didn't work.
You must know that this laptop is more than 5 years old, it's 1,5 GHz speedy, has 40 GB HDD, and has 256 MB DDR2 RAM. It runs Windows XP Service Pack 2.