If you need a browser which is less vulnerable to ActiveX, pop-ups and other stuff, use
Mozilla Firefox.
However, if you desperately want to stick to IE, use
Google Toolbar (no other search toolbars!!), it has an integrated pop-up blocker. Also, you should revise settings for the Internet Zone (turn off everything ActiveX related). It will break Flash and other compatibility, but that's worth the security.
Spyware and adware (like GAIN and the gay frog in the system tray) can be removed by various applications like
Spybot Search & Destroy or
Lavasoft Ad-Aware.
Applications which hide in your Startup folders might slow down the startup of your comp. You can remove them with any application like
StartControl or just go start - Run and enter [msconfig] into the Run edit box.
Internet Explorer ActiveX controls might spy your surfing behavior. Go to C:\WINDOWS\Downloaded Program Files\ and delete everything which seems suspicious to you (except of Shockwave Flash, Google Toolbar or Windows Update Class).
And, finally, you should install a virus scanner (which you should NOT download from Kazaa, eMule or other stuff because those p2ped virus scanners often contain virii by themselves). A firewall like
Agnitum Outpost Free can help protecting your system.
If you follow all those suggestions, your comp will be partly "back". However, better watch next time, don't install any useless apps (each and every apps leaves traces) and configure Internet Explorer to be secure.
Still have any questions? PM me...
dumbthingy
Inofficial Security Consultant :rambo: