ferst an foremost .... Virus scan
[yeah yeah we all know you not got a virus, be cooz i use X antiV and its good, an i neva had a virus since i used it][so is it gunna hert you to make sure?]
the choice in my opinion is ''malwarebytes'' [none of them are infallible]
secund ......
clik
>start
>all programs
>accessories
>system tools
>disk clean up <<< [run that and clean up the disk][temporary files especially]
therd .......
clik ya way down to >system tools< again
this time choose
>disc defragmenter <<<
this option will take ages,
[ its like doing 10 loads of washing, if you get them out the wardrobe one day at a time, and then when you dried 10 loads, just chukin them in the corner in a pile ..... defrag hangs ya clothes back in the wardrobe in order. the grubier the pile the longer it takes to sort ... and the grubier the pile the longer it takes to find two matching sox]
''Ccleaner'' is a fee program, as its original name 'CrapCleaner'' suggests, it cleans up a mirriad of ''crap'' across all browsers, system, temporary files, cookies, flash cookies, caches, logs, history ...... it won't wipe you bum, but thats about all?
it will also clean your registry ..... a good move [next option under ''clean'']
under the ''tools'' menu is a ''startup items'' button, where you can disable things from always starting when you boot, they do nothing till you clik the program you want, but are always set to start on boot up .... sometimes running in the background tying up resources that just waste resources?
DUST!!!! number one killer of a CPU is dust leading to overheating, and if not failure, the least is poor performance ... [yeah yeah you a clean freek, there no dust in my house] ... if it a PC tower, pop the screws, and clean it oot, the vacuum on blow mode? or other method if you have a decent way of not blowing the components oot the case, you only want the dust oot. if it a lappy, pop all the covers on the bottom, and squirt it oot, but lappy's tend to show with the fan intake vents being grubby.
if this is of no help? it will do no harm.