7 suddenly became slow

[Frostmourne]

Install new drivers - chipset, BIOS, gpu, sound, wireless, and you can use a bit of my tutorial in my sig if you are unsure. Then delete all of Toshiba's crapware and post a shot of your installed programs and the startup tab of msconfig.

 

[maxcool1234]

Just for grins and giggles uninstall Kaspersky and see how your system responds... Kaspersky has been known to cause these type of issues in Windows 7 ...

yep thats true kaspersky is having problems in updating WEI scores once installed may be they have corrected it in latest patch A

Also there are lot of other issues