Installed new drivers, windows 7 completely gets trashed in speed  

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New drivers for what ?

Just roll back to the last driver.

Device Manager - Roll Back Driver

Trying that.

Edit: rolled back all drivers that were recently installed, no fix

Critz said:

I recently installed new drivers via SlimDrivers, but now my computer is basically working like a potato. Applications take at least an hour to open, typing something into the Start Menu freezes it and closes it, and bootup is EXTREMELY slow.

I do not have a Wndows 7 disk nor a USB to do a clean install, but if there is another way to repair install/clean install without the use of a windows disk/USB, please let me know. thanks.

You cannot perform a repair install or a clean install without the ISO/DVD of the OS.

See the Step 1 of this guide: Clean Reinstall - Factory OEM Windows 7
It will give you some idea about how you can try to obtain an ISO. You may search for a windows 7 iso in the internet too (but never the altered ones). If you put your own license key, then the source of the installer ISO is not a matter of headache, it would not be counterfeit.

About the issue, If you use any sort of third party driver updater, you are calling trouble for yourself only. They not only fail to do the right job but also do lots of bad jobs. The later steps of the guide linked above makes a windows installation driver complete itself.

GokAy said:

System Restore to a date prior to installing SlimDrivers (there may be one just before installing it).