You can create a Windows 7 System Repair Disc from any Windows 7 computer. However, if your computer is running a 32-bit version of 7 then the computer you use to create the repair disc must also be 32-bit. Likewise, if your computer is 64-bit then you must use a 64-bit computer to create the repair disc. The repair disc will hopefully allow you to boot your computer into the system recovery options. System restore is one of those options.
System Repair Disc - Create
Another possibility is to see if you can access a hidden recovery partition on your hard drive. I believe that with an HP computer you immediately start clicking
and keep clicking the F11 key as soon as you power up the machine. That should (again hopefully) give you access to several recovery options. You may have a system restore option available but I'm not familiar with HP products. You should have a recovery manager option available which would let you return your computer to factory specs - just like it was on the day you bought it.