1)viruses,trojans,malware,etc..
2)damanged registry.
3)fragmented hard disk.
4)having many startup programs.
VIRUS :
By running a PC scan you can know if your system is affected with virus.
REMOVING STARTUP PROGRAMS:
1)Goto Start-->Run.
2)type msconfig and hit enter.
3)now navigate to startup tab.
Tick only those programs which you want to run on startup and click apply and then ok.
FRAGMENTED HARDDISK:
2)type disk degragmentor and hit enter
3)now perform defragmentation.
FIX HARD DISK ERRORS.
1)Goto Start --> Run.
2)Type CMD and hit enter.
3)Type chkdsk and hit enter to fix HDD errors in C drive.
4)To fix errors in other drives type CHKDSK /F and hit enter.
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