PC S.O.S.! Restoring svchost.exe and possibly Windows XP Functionality

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This happened to me last night, and it's a long story, so please keep up on what i'm saying here. My computer's in trouble and I need to let you know on my grave situation. Last night I ran into a nasty little sucker of spyware that kept restarting and restarting my computer, and it also slowed down my computer as well. I figured that this spyware piece is coming from: C:\windows\system32 So I had to get there and whadya know? THERE IT IS! So as I got closer to the spyware, selecting it and deleting it, I keep getting that it's being used and it can't be deleted until I shut it down. That's where I used both the Task Manager and recently Process Lasso, the same program that stopped my Windows Explorer issue. (I gotta thank the user who gave me the site earlier...) I shut down the infecting programs, and then I went back to System32 and deleted all of the files, ESPECIALLY svchost.exe which could've been corrupted (since I can tell that the date was the same with the files of the spyware I deleted). I went back to the Task Manager and Process Lasso to shut down svchost.exe in its multiple forms, and I deleted it. By then, it kept doing the countdown clock before it shuts down, and I had to go to the MS-DOS command program, and thanks to learning some commands like "shutdown -a" (to abort the shutdown procedure), I kept Windows XP open. However, I had to get through ALL of the accounts in order to eliminate it. Now keep in mind that my computer has Windows XP Home Edition, and not Professional. When it shut down by itself again, it's not back to normal as the account slowly started up, and I started the Task Manager. That was when it wasn't in the Windows XP Blue skin, but in its barebones Windows 98-ish Classic body exposed. Later on, the taskbar and Start Menu was the same, and when I opened Windows Explorer, it showed up, but it wasn't in the taskbar. I found the problem. I deleted svchost.exe because it might've been infected by the spyware, but at the same time, it disabled my ability to do these things: -System Restore -Drag and Drop -Cut, copy and paste -Surf the internet -svchost.exe was still in my Recycle Bin, but I couldn't restore it or cut it. I was getting even MORE stressed out, and since I have a lot of files I still need to backup and delete, I can't reinstall Windows XP. It's an eMachines. svchost.exe was missing from my Task Manager and my system32 folder, and today i've read that it was an integral part of my PC. I know i've learned my lesson, but I couldn't let it infect my PC at the same time. I don't have a Windows XP CD, and i've looked inside my eMachines Restore Disk for the same file, but it wasn't there, and even if it was, I can't drag, drop, cut, copy or paste it back to System32. Is there any way I can restore svchost.exe back to system32 and restore my PC's functionality, and it's regular Windows XP look, back to normal?