explore function doesn't work

Please bear with me as this is my first post here.
I must have picked up something from the internet that is causing havoc with my computer. It resets my homepage automatically to some page I have never seen. Also I can no longer access explore from my computer nor control panel. My computer locks up everytime I try to explore to see what's been added to my system. Please help if you can.
Thanks

Download, install, update, and run AdAware and SpyBot.

[R.I.P.]

easy........Do as Joleen suggests.....it should correct the problem

Ad-Aware ......  http://www.download.com/3000-2144-10045910.html?part=69274&subj=dlpage&tag=button

SpyBot..... http://www.download.com/3000-8022-10122137.html

Don't forget to get the updates......

Good luck

dl65  

Thank you both for your help, I did just as you suggested and updated and ran both programs. Part of my problem is fixed. I can run my computer now without it locking up on it's own but it still locks up anytime the explore funtion is needed. Could have I accidentallly deleted a needed file? I can't run certain programs nor can I use the explore my computer or control panel without it locking up. Additionally, when I reboot I get this message "C:\Windows\sp.dll: Error opening the file. There may be a disk or file system error."
Thank you again for your help and I would appreciate any additional help with this problem.

[R.I.P.]

easy.......there is a good chance that  " sp.dll " is part of one of the bugs you had ........but before you do anything radical......try D/L Pest Patrol is it supposed to detect and remove this threat....
http://www.antivirus-online.de/english/counttro.php3?a=1229    

Hope this solves your problem

dl65  

http://www.dll-files.com/dllindex/dll-files.shtml?sp - sp.dll

http://www.liutilities.com/products/wintaskspro/dlllibrary/sp/ - sp.dll information.

Donot download this .dll file, it isn't missing do as DL65 says.