A bit vague. I would guess you have to many running programs. Use these two freeware programs 1, CCLEANER at:
http://www.filehippo.com/download_ccleaner/, This will clean the junk from your machine. In the TOOLS section, STARTUP, Disable ALL unnessary Startup programs. Remove ALL TOOLBARS they all killers on broswer speed. 2, MALWAREBYTES at :http://www.filehippo.com/download_malwarebytes_anti_malware/ In the install, UNCHECK, the PRO TRIAL version, you want the freeware version. Run A FULL SCAN, DELETE ALL RESULTS, REBOOT. REMEMBER, Every program that "runs at windows start"and runs in background needlessly, slows down your machine, over time they add up. When you install a program look for the "start at windows startup" and UNCHECK. For further assistance respond to this post.