Windows Suddenly running very slow!

Firstly I apologise if i have posted this in the wrong section...

Okay it all started when somehow my internet wasn't working, thinking there was some spy/mae in my computer, i ran Lavasoft ad-aware SE personal and Symantec Antivirus and did full scans on both softwares.

Then out of the blue my internet returned (like after an hour) and found out it was most likely my internet provider's problem. Thus I stopped the checks but i made sure I deleted any stuff the 2 programmes found...after that, my computer was like SUPER laggy till the point I had to reboot it...

After the reboot, my computer took an amazing 15 over minutes to start up. Showing my computer's background wallpaper for a good 10 minutes...And after it had fully booted up (see the icons and all) I found out I had no internet (says there is no or little connectivity) at all!

Is there something wrong? What should I do? I really need help >.<

Also long before this incident happened, I had installed zonealarm but everytime i click on the icon (or even go to my programme files to open it) it just willn't open! Any ideas why? Or do I have a virus that's keeping me from opening it?

Thanks for any help you can give me guys

 

Can you right-click zonealarm and get in to options that way? Or via the Start>All Programs menu? If you can, try temporarily disabling ZA and see what difference that makes. Be sure to re-enable it afterwards. If this makes no difference I would work through this link and if you are still then having issues, make a post in the Malware Forum including the attachments as described in the link.

http://forums.majorgeeks.com/showthread.php?t=38752

You need to follow each and every step