Ad Aware will fix slow running Internet Explorer.
I had the following problem. Internet Explorer was slow to scroll webpages and very slow to display typed information such as typing into the ebay search box.
I found my browser homepage sometimes changed also, so I knew a browser hijacking program had been installed on my hard drive.
I went to www.lavasoftusa.com and downloaded the free version of their "Ad Aware" program, installed and ran it, and it found and identified the malware files which had been added to my system registry, and on my hard drive.
After Ad Aware quarantined these files, I restarted my computer and ran another scan and found nothing.
Then I tested Internet Explorer and it ran perfectly again. PC-World magazine has given this program "best product" award and it deserves it.
Hope this helps a few people.