Pages are loading extremely slow in IE. I did a scan with Avast and got the following result:

c:\windows\system32\activescan\pskavs.dll is infected by WIN32:CTX

Avast would not let me repair this file. Can I delte this file without causing further harm to my system?

Although the Win32:ctx sounds scary, it's most likely a false positive.
http://www.avast.com/eng/faq_panda.html

This a false positive detection caused by Panda's on-line scanner not encrypting its virus signature files. Active Scan is the folder created by Panda's on-line scanner you can delete the whole folder. Because of its location in the windows\system32\ folder system restore may save a copy of this, so you may need to disable system restore, reboot and then delete it.

Hope this helps

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