Searches go to "windowssearch.com" GoogleInstaller Error, Computer boot issues, DEATH

Greetings,

I'm in deep crap. Basically I was doing research on my work computer. It required me downloading some files as samples. End result is I downloaded some file and now my computer is all *** backwards.

Computer:
Dell Precision M2300
WinXP Pro
4gb Ram
2.5ghz Dual Core Processor

Symptom 1: I get a Google Installer error when booting up.

Symptom 2: When in IE or Firefox, I get redirected to "Windowssearch.com" and overall piss poor browsing. Sometimes it works perfectly, other times its slow and awful. I'm assuming based on my research I'm getting all of my packets passed through a proxy before they get to where they are supposed to.

Symptom 3: I can't install/use any virus software. They've all been disabled. I either can't access the websites or can't run the applications. To install HiJackthis I had to grab an older version, drag and drop it from another computer. I was able to install Spybot S&D, it "runs", but it won't scan. I can't get the Malbytes application to even think about installing. It's ridiculous. I know I can install software because I've installed other applications.

Symptom 4: The computer boots up like crap. It takes about 4-5 times to boot up. Once its up, the speed is fine. No real issues in "other applications."

Symptom 5: I can't go to any restore points. The "next" button acts dead. No errors or anything like that. It just acts as if someone forgot to make the next button do something.

Here is the deal. I need to fix this computer tonight so I can continue doing my job. It's that simple. I can reformat the computer in a few weeks and get it virgin again. Right now I need this stuff off so I can hobble through the next 4 weeks. I will pay someone to walk me through fixing this problem.

PM me for contact information.