Any chance you changed your drivers recently?
If so try rolling them back.
If it worked okay one day and not the next you have something else going on.
There is always a chance you are getting bogged down by hidden spyware or ad ware.
If it is a spy/ad ware problem, here is the best program I've found to deal with it.
Very ImportantHijackThis examines certain key areas of the Registry and Hard Drive and lists their contents. These are areas which are used by both legitimate programmers and hijackers. It's up to you to decide what should be removed. Some items are perfectly fine. You should not remove them. Never remove everything. Doing that could leave you with missing items needed to run legitimate programs and add-ins
The point I want to make sure you understand is NOT to pick any items and tell the program to clean them unless you are 100% sure.
All I want you to do is run the program and choose
"Do a system scan and save a logfile"
Then email me back the logfile.
You can either attach the logfile or copy and paste it into the email.
After I get the logfile I'll be able to tell what keys and files are being hijacked by any adware running on your computer.
I'll then have you do another system scan and tell you what keys and files to checkmark to clean up your system .
You can download the file here
HijackThis.zipYou'll need to extract it
You can unzip it anywhere you want
i.e. c:\temp
Then browse to the directory you unzipped it to and run the program.
Just Remember [/B]DO NOT PICK ANYTHING TO CLEAN[B]
Pick the option to scan and save a logfile