All of these are redirecting stuff to easy-search.biz, unless this is your intention, you should tick the boxes in hijackthis and then click Fix Checked (these could be taking you to some dubious sites where infection is more likely). The last one about:blank could be valid, the bit about ‘HomeOldSP = about:blank’ seems strange.

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://easy-search.biz
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://easy-search.biz
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://easy-search.biz
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = res://C:\WINDOWS\system32\yymxr.dll/sp.html#37680
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://easy-search.biz
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://easy-search.biz
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://easy-search.biz
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = res://C:\WINDOWS\system32\yymxr.dll/sp.html#37680
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://easy-search.biz
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://easy-search.biz
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://easy-search.biz
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank

You are also running a lot of programs at start up (the Run entries) check and confirm that they are valid and need to run at startup.

Check all the Run entries (the .exe filenames) that are not familliar use google to search, I have just checked these three that are suspect, with a link to an information page below it (returned from the google search).

O4 - HKCU..\Run: [windllsys32.exe] C:\WINDOWS\System32\windllsys32.exe
[b]http://www.techsupportforum.com/showthread.php?t=13944[/b]
O4 - HKCU..\Run: [runwin32] C:\WINDOWS\runwin32.exe
[b]http://securityresponse.symantec.com/avcenter/venc/data/pwsteal.allight.html[/b] this one could be passing/stealing your passwords, so you should change them all when you finally get rid of these.
O4 - HKCU..\Run: [wininet32] C:\WINDOWS\wininet32.exe
This is also suspect

There really are too many to deal with all at once, and you should deal with these and run hijackthis again and either using Eddy’s analysis program http://members.home.nl/edeijl/download/hjt5.005.exe

This should get you started but your computer is seriously compromised.

Edit: whocares bet me to it by a few minutes whilst I was searching using google and his overall analysis is correct and you may need to consider a format and clean install.