Deleted lower filter registry, can't boot

Oh boy,

So I made a major mistake when trying to fix my CD drive. I read a few steps on how to fix windows from not recognizing your CD drive and read about deleting the registry entry:4D36E965-E325-11CE-BFC1-08002BE10318 for lower and upper filters. Like a bimbo, I did not find the lower and upper filters in 4D36E965 but I did find it in 4D36E967 I think. Whatever it was, I noticed that one of the entries was entitled disk drives (rather than CD/DVD ROM). I didn't think it was a huge deal if I deleted the upper filter listed in this section because I had system restores, but now my windows won't boot.

I get a microsoft boot fixer come up that runs a long scan, tells me it cannot fix it and that it is something hardware related (if I recently installed any new hardware or usb devices, remove them and restart). I cannot system restore (it says I have no restore points) and cannot do much of anything. I do not have a 7 boot disc here (can get one from a friend), but my CD drive was not working to begin with so I am not sure how I can fix this problem.

I am running Windows 7 on a HP Pavilion laptop (dv2000 series). Please let me know if there is anything short of bringing it in to a repair shop that I can do to fix my computer!

Thanks in advance

Additional information:
After the startup repair runs it tells me in the repair details:

Unspecified changes to system configuration might have caused the problem.

Repair action: system files integrity check and repair
Result: failure. Error code = 0x490
time taken = 822796 ms