Windows 7 Service Pack 1 made my computer slow down

Late december 2011 and SP1 still killing computers. My HP quad-core 64bit started by running slow and absolutely crawling on the internet. Tried the above fixes disabling this and that with netsh, no go. Now the internet doesn't work at all, but says I'm connected and the troubleshooter can't find any problems. Tried system restore, went to 3 different restore points. Still not working. Says SP1 is gone, but problems persist. I can ping ip addresses but not domain names. Other computers on the same network operate just fine. Found my serial # for my Windows 7 Ultimate, can't find the disk. Made a restore disk to boot from using one of my Windows Backup images. Glad I set them up. Just wish the "Restore from Image" link in Windows Backup worked...but it did nothing. SFC found some errors, but fixing them seems to have changed nothing. Noticed a Realtek driver was "not compatible with this OS" in the error logs, updating drivers did nothing.

So I write this from my perfectly working XP system while I wait for Restoring Disk C to finish....meanwhile I'd like to add to the additional complaints on here about the "help" received. If you can't understand the problem, please don't try to comment on it. Google it, there are thousands of users experiencing this. Telling them to select this, disable that, change whatever isn't helpful when you're guessing. Telling them it's their fault is just inflamatory. Read through the posts again, there are a lot of people who put SP1 in from a clean install. That means it's not their 3rd party applications, it's not a virus, it's not ignorance of the error logs. It's a bad update that's disabling their computer. I'm glad some of the fixes worked for some people but it would be great if any of it worked universally. It would be even better if MS fixed it. They should know by now what SP1 will screw up and what it won't. You'd think they'd make a simple fix and update their software? Sadly us everyday ordinary users are constantly stressed by having to decide to trust MS or leave our system potentially vulnerable. I get that Windows 8 is right around the corner already, but this being an extremely successful OS you'd think that they would put a bit more care into it. That's what the complaints are. Yes we all should have our personal IT guys here checking our error logs and updating drivers but the reality is we don't. We are the average ordinary everyday users that Microsoft targeted it's product towards. We are the people who spent $200-$600 on a computer and expect it to work. We are the people who don't use NETSH to fix problems. We are the customers. And for an update to be screwing up computers for over 10 months is just sad. What's even worse is that there is not 1 universal fix.

I'm off my soap-box and back to watching the blue bar creep across the screen. If anyone reading this is contemplating SP1, just realize that your computer MAY become unstable and if it does....nobody yet knows how to fix it.

The solution suggested by Tom Lindy to disable TCP autotuning seemed to help considerably.  In case you land on this page before seeing that, here's an image he cites showing what you do from the command prompt:

http://www.sysprobs.com/wp-content/uploads/2009/12/netsh.png

It's on page 10 of this litany of complaints with so few solutions.

Also, If you are experiencing very high CPU usage after 7 w/SP1 starts see:

Windows 7 computer slow after SP1 upgrade due to high mscorsvw.exe CPU usage    

(scroll all the way down for the instructions, which I haven't tried yet.)

Yeah.  Agree with notion it's a MSFT problem.  Just installed SP1 on an oldish laptop that dual boots XP and 7.  Both were running satisfactorily.  Installed a ton of security updates on XP, slowed it a little, but haven't cleaned up yet.  Installed SP1 on 7, now it runs like a cross between a pig and a turtle.  Seems to have decreased efficiency of processor, memory and page file usage. 

It is amazing that MSFT hasn't researched this and posted every conceivable fix to a forum like this.  I have a bunch of their certs and was an MCT for 4 or 5 years, and the company rarely fails to disappoint me. 

I'm using xp now, and just started looking into the 7 SP1 problem.  Will try the two fixes posted here - just wanted to note that 11/18.

And just a note to the guy who said you have to install SP1 if you want your computer to be up to date -  What everyone has been saying here is that in this case being up to date means having a computer that sucks.