T_a_B ... relax.
"Ever since yesterday.."? hehehe
How long is ur G up and running ? Since January..Feb.?
Clean it out.
Go through Programs and Features in Control Panel .. and delete the junk
you dont use. (Tool bars ... ect.)
Go to run (enable it in taskbar properties if it is not) Msconfig>StartUp Tab...
It is choked.

You could simply do a system restore point .. if you were confident of when it started.

HiJackThis is also 'fun'.

Better still back up the files you 'need' to save.
and do a fresh install...Best of Luck.c.