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Computer Running Slowly, CHKDSK automatically cancels on startup
My laptop has been running extremely slowly lately. It takes longer than usual to load regular programs and any web browser activity takes ages. I have run malware (Malwarebytes) and virus scans (Microsoft Security Essentials) and removed some items. Malwarebytes didn't detect much, but I found a trojan with Security Essentials. However, after removal my problems persist. I have scanned and attempted recovery of bad sectors. Issues were found and fixed, but a disk check was said to be necessary. I tried running chkdsk c: /F, but the disk check cancelled within a fraction of a second on startup.
Any ideas on what I need to do? I am running Windows 7 Home Premium 64bit on a Lenovo Ideapad Y550.