1 – Click on Start Button of your computer see in image,
2 – Write in Box “%temp%” and enter.
3 – You will see lots of temporary files which are slowing your PC speed.
4 – Select all files and delete them so some files will be remain undeleted so it is not bad so do not worry.
5 – Also Removed from Recycle bin and refresh 2 or 3 times.
Increase Your Speed With RAM
If you PC is very slow second option is to increase your RAM in PC because some time low level RAM make speed slow in PC. SO 2MB RAM is good but if you increase at 4MB which will make more good PC speed.
Increase Your Speed With Good Hard Disk Space
If your PC RAM is good and also no temporary files but PC speed is still very slow and also not installing any software in your PC which mean Hard disk is not good enough. Increase your hard disk will also be cause of good speed.