Run another scan with Hijack This, place a check by both of those, and click "Fix Checked".
Here is some information on your infection: http://spywarefiles.prevx.com/RRHDDH037432978/MSIWA32.EXE.html
I suggest, after fixing what you find, fully updating your virus and malware protection (it doesn't seem like you have any virus protection according to your hijack this log?) and running full scans. If you don't have any, I highly recommend Avira AntiVir www.free-av.com)(If you don't mind the advertisement that seems to pop up once a day) as it seems to be very robust. Short of that, Avast! ( www.avast.com ) (If you like a hands-on approach, as Avast! requires manual updates and scans, though it can schedule scans on boot) or AVG ( http://free.grisoft.com/doc/5390/us/frt/0 ) (Good protection- not the best, in my opinion, but it be more than adequate-, automated scans and updates, some neat features).
Also, I suggest Comodo BOClean and SpywareBlaster for active protection against malware. They work pretty good hand-in-hand, BOClean prevents it from getting on, SpywareBlaster seals off the likely hideouts and critical areas. www.comodo.com , http://www.javacoolsoftware.com/spywareblaster.html respectively.
And A-squared free ( http://www.emsisoft.com/en/software/download/ ) I find to be a very thorough program for on-demand scanning. It works well with Spybot.
Ok, so once you have that sorted out, run fully updated, full scans. You might also want some free online scans:
CA Virus Scan: http://www.ca.com/us/securityadvisor/virusinfo/scan.aspx
CA Malware Scan: http://www.ca.com/us/securityadvisor/pestscan/
Trend Micro HouseCall http://housecall.trendmicro.com/
Microsoft Live OneCare Safety Scanner http://onecare.live.com/site/en-us/default.htm
BitDefender Free Online Scanner http://www.bitdefender.com/scan8/ie.html
McAfee FreeScan http://us.mcafee.com/root/mfs/default.asp?affid=294
Windows Malicious Software Removal Tool http://www.microsoft.com/security/malwareremove/default.mspx
Symantec Security Check http://security.symantec.com/sscv6/d...d=ie&venid=sym
Panda ActiveScan http://www.pandasecurity.com/usa/
---Under this line does not remove, only finds, threats---
Webroot Antispyware Scan: http://www.webroot.com/En_US/land-spysweeper-freescan.html
Kaspersky Free Virus Scan http://www.kaspersky.com/virusscanner (Seems to be too sensitive)
Prevex free scan: http://info.prevx.com/downloadcsi.asp
You might want to try Prevex, as it is the site that had the information on your malware! Just as another check.
Once you're confident you're clean, run windows update and/or go to support.microsoft.com and update your copy of windows.
You should be good now!
Post back with results!
Good luck,
--The Comodore