if you want to try a registry cleaner. I've been using a this one for 4 months with no problems. I used to use JV16, but that's a 'pay' program and this one is free and works just as well (IMHO).
http://www.glarysoft.com/It's called Registry Repair. After you clean the registry the first time, run the program again, as some registry goofs don't show up until other goofs, above them are removed.
Here's another program that is VERY good at finding those annoying hidden registry entries that companies use to limit the number of installs, etc, etc. This program does have a free version and it also has a 'donationware' version, with a fixed 'donation' price.
http://www.databack4u.com/snc/rtkf_eng.htmlI used to use 'Your Uninstaller' but that company hides it's registry entries, especially the registration entry, so that if you screw up an install, it prohibits you from re-installing the program. Jv16 didn't find the entry, but Registry Trash keys finder, found the hidden entry and fixed the installation problems I was having. It's very good at finding those hidden 'screw-with-you' entries. Make certain, you are sure the entry you select for deletion is the one you want gone, so you don't shoot yourself in the foot.
Like Baldeagl said, anytime you mess with the registry, you're walking through a mine field. So I was suggest you make an image backup of your system before using either of these programs, especially Registry Trash Keys Finder.
If you don't have image backup software, then you can download the following as it's free.
Self Image (this is the one I like, and I'm watching for the options I want which are
slated to be included in a later version)
http://selfimage.excelcia.org/If you have a network, it will backup the image over the network, but at present it creates one image file, instead of automatically breaking up the image into DVD-sized portions for burning on a Dvd. You can backup the image over the network or to a second drive.
The best software for image backup, (IMHO), is Acronis True Image Home, but it costs around $50.00 these days. It will break up the image into DVD-sized bits for burning, and has lots of other nice features, that Selfimage is starting to have.
If you have more then one system on a network, or a seond hard drive, that can hold the image, Selfimage is free and should do the job for ya just fine, so you won't have to spend the money on Acronis.
Also are you running 'System Restore'? If so you can try restoring the system to a date before the date you initially had the problem with the update. If you have 'System Restore' running, then I would suggest trying that first, if you can't find anything in the autoexec.bat or config.sys, like Baldeagl suggested. System Restore unfortunately doesn't work most of the time, but it might do the trick just the same.
If you have any problems, or concerns, post here, or PM me, as I might not see your post, and I'll try and help ya out.
Good Luck!
Wabbit