Tap the F8 key over and over till you get to a screen that gives you startup options choose start windows in safe mode when it gets into safe mode see if your task bar and start menu are there if they are then you have something running that is keeping your start menu andf task bar from showing,
I asume you are posting from this machine? If so then I am going to assume you are able to get to the net.
Go here
http://housecall.trendmicro.com/ Choose scan my pc and let it do its thing. It is a good online virus scan that will find and fix most problems. If after running that you either find no virus or it doesnt solve your issue then go here
http://download.com.com/3000-2144-10045910.html?part=69274&subj=dlpage&tag=buttonhttp://housecall.trendmicro.com/Download adaware install it and then follow these instructions.
Before you scan with AdAware, check for updates of the reference file by using the "webupdate".
Then ........
Make sure the following settings are made and on -------"ON=GREEN"
From main window :Click "Start" then " Activate in-depth scan"
Then......
Click "Use custom scanning options>Customize" and have these options on: "Scan within archives" ,"Scan active processes","Scan registry", "Deep scan registry" ,"Scan my IE Favorites for banned URL" and "Scan my host-files"
Then.....
Go to settings(the gear on top of AdAware)>Tweak>Scanning engine and tick "Unload recognized processes during scanning" ...........then........"Cleaning engine" and tick "Automatically try to unregister objects prior to deletion" and "Let windows remove files in use at next reboot"
Then...... click "proceed" to save your settings.
when the scan is done go to the next page where it lists everything it finds right click on one of the entries and have it select all objects then have it remove them by clicking proceed rebbot your puter.
If you still have a problem then download hijack this from here
http://www.spywareinfo.com/~merijn/downloads.htmlput it into a folder of its own then run it hit scan do not fix anything! have it save a log of the scan and then post the log here and i will take a look at it and see what you have left in there that might be causing you trouble.
I have to go out on a tech job in an hour so if you havent updated this post by then I will have to get to it after i get back in a couple hours so be patient.
Ot I highly recomend this site if you cant wait
http://forums.techguy.org/index-.htmlPost your problem there and the good folks there will help you.