Hi four days ago my computer all of a sudden started struggling with simple tasks, it will take 30 secs just to open notepad, or explorer or basically any task while as before everything was pretty much lightning fast. Havnt installed any new software or hardware, had windows defender update but, like said, tried bacup recovery and same thing even going back 2 months... Have tried system restore, registry cleaners, anti virus, ad ware, malware.....Nothing seems to be showing up in Task manager as well except for sudden spikes that happen continuously, although not showing what it is..... I have win 7Ultimate 64 bit, Intel icore7, q720 1.60ghz, 6gb ram. ATI Mobility Radeon HD 5850 1gb, 640 harddisk, Please help, cant find anything on what this could be?
Try opening up your Microsoft XPS Document Writer and make sure it isn't clogged up.
Start Menu -> Devices and Printers -> Microsoft XPS Document Writer
If there are any documents queued in there, delete them. This is a common source of computer slowdown that is not resolved by antivirus or antispyware software.
Of course, if nothing else works, the most drastic solution to fix this would be to reformat the hard drive and reinstall Windows.