Click start then all programmes, accessories, system tools, system information, tools, run system file checker and replace any files it shows as missing or corrupt.
Reboot the PC then keep tapping the F8 key right after the beep until you get the options screen, select command prompt only, type scanreg.exe /fix then press enter, when this says the registry has been repaired, press enter, then press ctrl + alt + delete keys together to reboot.
Run Windows defragmenter
Run Panda Scanhttp://www.pandasoft....com/activescan
Get Tune Up Trialhttp://www.tune-up.com
Run disc clean up then registry clean up then click optimize to run reg defrag, which will take a while and requires a reboot
Run Tune Up, optimize, system optimizer to run optimize computer configuration, which needs a reboot.
Run Tune Up, optimize, system optimize to run internet optimization, which needs a reboot.
Run Tune Up, optimize, system optimizer to run system advisor.
These steps will place the file system in order, replace corrupt or missing files, replace the registry structure, remove obsolete registry entries and clear the system of software errors.